/* 
 * INIT OOG LIGHTBOX
 *
 * Adds the html for lightbox to document and inits some variables/events.
 *
 * Parameter:
 * String  phpBackEnd  (path to requests.php)
 * String  flowplayer  (path to flowplayer swf)
 *                      
 * Returns: -  
 */     	
function initOogLightbox(phpBackEnd, flowplayer) {

  oogLightboxRequests = phpBackEnd;
  flowplayer_swf = flowplayer;

  var oog_lightbox_html = '<div style="height: 0px; width: 0px; visibility: hidden; position: fixed; top: 0px; left: 0px;" id="oog_lightbox_overlay"></div>' + 
'<div id="oog_lightbox_loading" onclick="exitlightbox()" title="You can also cancel loading by pressing ESC">' + 
'<br />' + 
'<p>Hier klicken, um abzubrechen</p>' + 
'</div>' + 
'<div id="oog_lightbox_main">' + 
'<table id="oog_lightbox_photo_box" border="0" cellPadding="0" cellSpacing="0">' + 
'<tr>' +
'<td id="oog_lightbox_shad_topleft"></td>' +
'<td id="oog_lightbox_shad_top"></td>' +
'<td id="oog_lightbox_shad_topright"></td>' +
'</tr>' +
'<tr>' +
'<td id="oog_lightbox_shad_left"></td>' +
'<th id="oog_lightbox_photo_border">' +
'<div id="oog_lightbox_photo_wrapper">' +
// Oog-Lightbox will paste file here!
'</div>' +
'<div id="oog_lightbox_filedescription"></div>' +
'<div style="display: none;" id="oog_lightbox_extended_box">' +
'<div id="oog_lightbox_extended_box_request">' +
'</div>' +
'</div>' +
'</th>' +
'<td id="oog_lightbox_shad_right"></td>' +
'</tr>' +
'<tr>' +
'<td id="oog_lightbox_shad_bottomleft"></td>' +
'<td id="oog_lightbox_shad_bottom"></td>' +
'<td id="oog_lightbox_shad_bottomright"></td>' +
'</tr>' +
'<input type="button" onclick="exitlightbox()" id="oog_lightbox_close_but" title="Close | Esc" />' + 
'<div id="oog_lightbox_previous_radius" onclick="previous()">' +
'<input type="button" id="oog_lightbox_previous_but" title="Previous Photo | Left Arrow Key" />' + 
'</div>' + 
'<div id="oog_lightbox_next_radius" onclick="next()">' +
'<input type="button" id="oog_lightbox_next_but" title="Next Photo | Right Arrow Key" />' + 
'</div>' +
'</table>' +
'<div id="oog_lightbox_functions">' +
'<div id="oog_lightbox_functions_buttons" style="text-align:center;">' +
'<input type="button" onclick="slideshow()" id="oog_lightbox_slideshow_but" title="Start/Stop Sildeshow" />' +
'</div>' +
'</div>' +
'</div>';

  document.write(oog_lightbox_html);

  lightbox_overlay = document.getElementById('oog_lightbox_overlay');
  lightbox_main = document.getElementById('oog_lightbox_main');
  lightbox_loading = document.getElementById('oog_lightbox_loading');

  var first_windowheight = (window.innerHeight) ? window.innerHeight : window.document.documentElement.clientHeight;
  var first_windowwidth = (window.innerWidth) ? window.innerWidth : window.document.documentElement.clientWidth;

  lightbox_main_height_percent = lightbox_main.offsetHeight / first_windowheight * 100;
  lightbox_main_width_percent = lightbox_main.offsetWidth / first_windowwidth * 100;

  lightbox_main_top_percent = (100 - lightbox_main_height_percent) / 2;
  lightbox_main_left_percent = (100 - lightbox_main_width_percent) / 2;

  lightbox_main.style.top = lightbox_main_top_percent + '%';
  lightbox_main.style.left = lightbox_main_left_percent + '%';

  lightbox_slideshow = 0;
  lightbox_timeout = false;
  lightbox_extended = ''; 
  lightbox_firsttitle = document.title;
  isDescription = false;
  descriptionFocused = false;
  show_error_filedescription = true; 

  lightbox_loading_height = lightbox_loading.offsetHeight;
  lightbox_loading_width = lightbox_loading.offsetWidth;
  
  document.getElementById('oog_lightbox_next_radius').onmouseover = function() {
    document.getElementById('oog_lightbox_next_but').style.backgroundPosition='-54px 0px';
  }
  document.getElementById('oog_lightbox_next_radius').onmouseout = function() {
    document.getElementById('oog_lightbox_next_but').style.backgroundPosition='0px 0px';
  }
  document.getElementById('oog_lightbox_previous_radius').onmouseover = function() {
    document.getElementById('oog_lightbox_previous_but').style.backgroundPosition='-54px 0px';
  }
  document.getElementById('oog_lightbox_previous_radius').onmouseout = function() {
    document.getElementById('oog_lightbox_previous_but').style.backgroundPosition='0px 0px';
  }
  /*document.getElementById('oog_lightbox_playlist_but').onmouseover = function() {
    document.getElementById('oog_lightbox_playlist_but').style.backgroundPosition = (lightbox_slideshow == 0) ? '-17px 0px' : '-17px -17px';
  }
  document.getElementById('oog_lightbox_playlist_but').onmouseout = function() {
    document.getElementById('oog_lightbox_playlist_but').style.backgroundPosition = (lightbox_slideshow == 0) ? '0px 0px' : '0px -17px';
  }*/

}

/* 
 * RESIZE LIGHTBOX
 *
 * 
 *
 * Parameter: -                      
 * Returns: -  
 */     	
function resizelightbox() {

  refresh_lightbox_extended_box('', false);

  var windowheight = (window.innerHeight) ? window.innerHeight : window.document.documentElement.clientHeight;
  var windowwidth = (window.innerWidth) ? window.innerWidth : window.document.documentElement.clientWidth;

  var extra_margin_top = 0;
  var extra_height = 0;

  if(lightbox_extended != '') {
    extra_margin_top = extra_margin_top - 100;
    extra_height = extra_height - 150;
  }
  
  if(isDescription) {
    extra_margin_top = extra_margin_top - 12;
    extra_height = extra_height - 36;
  }
  
  heightspace = Math.round(windowheight  / 100 * lightbox_main_height_percent - 64 + extra_height);
  widthspace = Math.round(windowwidth / 100 * lightbox_main_width_percent - 54);

  new_photo_height = 0;
  new_photo_width = 0;

  if(resize_photos == 'all') {

    new_photo_height = heightspace;    
    new_photo_width = heightspace * (firstimgwidth / firstimgheight);

    if(new_photo_width > widthspace) {
      new_photo_width = widthspace;
      new_photo_height = widthspace * (firstimgheight / firstimgwidth);
    }

  } else {

    if(firstimgheight > heightspace || firstimgwidth > widthspace) {
      new_photo_height = heightspace;    
      new_photo_width = heightspace * (firstimgwidth / firstimgheight);

      if(new_photo_width > widthspace) {
        new_photo_width = widthspace;
        new_photo_height = widthspace * (firstimgheight / firstimgwidth);
      }
    } else {
      new_photo_height = firstimgheight;    
      new_photo_width = firstimgwidth;
    }
    
  }
 
  if(firstimgwidth != 0 && firstimgheight != 0) {

    if(mediafile_extension == 'jpg' || mediafile_extension == 'jpeg' || mediafile_extension == 'gif' || mediafile_extension == 'png') {
    

      new_photo_width = ( new_photo_height - 7 ) * ( firstimgwidth / firstimgheight );
    
      lightbox_photo.height = new_photo_height;
      lightbox_photo.width = new_photo_width;
      
    } else if(mediafile_extension == 'flv' || mediafile_extension == 'mp4') {
    
    
      new_photo_width = ( new_photo_height - 24 ) * ( firstimgwidth / firstimgheight );
    
      flowplayer_video.style.height = new_photo_height + 'px';
      flowplayer_video.style.width = new_photo_width + 'px';
      
    } else if(mediafile_extension == 'mp3') {
    
    
      new_photo_width = ( new_photo_height - 7 ) * ( firstimgwidth / firstimgheight );
    
      flowplayer_video.style.width = new_photo_width + 'px';
      flowplayer_video.style.height = '40px';
    
    }
    
  }
  
  $('#oog_lightbox_filedescription').css('width', new_photo_width + 'px');
  
  lightbox_main_width = $('#oog_lightbox_main').width();
  lightbox_main_height = $('#oog_lightbox_main').height();
  
  document.getElementById('oog_lightbox_next_radius').style.height = ( new_photo_height / 100 * 85 ) + 'px';
  document.getElementById('oog_lightbox_next_radius').style.width = ( new_photo_width / 100 * 45 ) + 'px';
  document.getElementById('oog_lightbox_next_radius').style.bottom = ( ( lightbox_main_height - ( new_photo_height + 64 ) ) / 2 + 34 - extra_margin_top ) + 'px';
  document.getElementById('oog_lightbox_next_radius').style.right = ( ( lightbox_main_width - ( new_photo_width + 54 ) ) / 2 - 16 ) + 'px';

  document.getElementById('oog_lightbox_previous_radius').style.height = ( new_photo_height / 100 * 85 ) + 'px';
  document.getElementById('oog_lightbox_previous_radius').style.width = ( new_photo_width / 100 * 45 ) + 'px';
  document.getElementById('oog_lightbox_previous_radius').style.bottom = ( ( lightbox_main_height - ( new_photo_height + 64  ) ) / 2 + 34 - extra_margin_top ) + 'px';
  document.getElementById('oog_lightbox_previous_radius').style.left = ( ( lightbox_main_width - ( new_photo_width + 54 ) ) / 2 - 16 ) + 'px';

  document.getElementById('oog_lightbox_close_but').style.top = ( ( lightbox_main_height - ( new_photo_height + 64 ) ) / 2 - 6 + extra_margin_top ) + 'px';
  document.getElementById('oog_lightbox_close_but').style.right = ( ( lightbox_main_width - ( new_photo_width + 54 ) ) / 2 - 10 ) + 'px';

  document.getElementById('oog_lightbox_photo_box').style.marginLeft = ( ( lightbox_main_width - ( new_photo_width + 54 ) ) / 2 ) + 'px';
  document.getElementById('oog_lightbox_photo_box').style.marginTop = ( ( lightbox_main_height - ( new_photo_height + 64 ) ) / 2 + extra_margin_top ) + 'px';

  document.getElementById('oog_lightbox_shad_top').style.width = new_photo_width + 28 + 'px';
  document.getElementById('oog_lightbox_shad_bottom').style.width = new_photo_width + 28 + 'px';
  document.getElementById('oog_lightbox_shad_left').style.height = new_photo_height + 28 + 'px';
  document.getElementById('oog_lightbox_shad_right').style.height = new_photo_height + 28 + 'px';

  lightbox_main.style.top = Math.round( windowheight / 100 * lightbox_main_top_percent ) + 'px';
  lightbox_main.style.left = Math.round( windowwidth / 100 * lightbox_main_left_percent ) + 'px';

  lightbox_overlay.style.position = 'fixed';
  lightbox_main.style.position = 'fixed';

  lightbox_overlay.style.height = '100%';
  lightbox_overlay.style.width = '100%';
  
}

/* 
 * LOAD MEDIA
 *
 * 
 *
 * Parameter: -                    
 * Returns: -  
 */     	
function load_media() {

  // make loading visible //
  $('#oog_lightbox_loading').fadeOut(0);
  lightbox_loading.style.visibility = 'visible';
  $('#oog_lightbox_loading').fadeIn(fadeInOut_loading);

  // add name of file to document title //
  document.title = lightbox_firsttitle + ' - ' + oog_photoname;

  // clear filewrapper & description //
  document.getElementById('oog_lightbox_photo_wrapper').innerHTML = '';
  document.getElementById('oog_lightbox_filedescription').innerHTML = '';
  
  // if have to load an image //
  if(mediafile_extension == 'jpg' || mediafile_extension == 'jpeg' || mediafile_extension == 'gif' || mediafile_extension == 'png') {

    // insert img element for photo into the filewrapper //
    var img_tag = document.createElement('img');
    var img_tag_id = document.createAttribute('id');
    img_tag_id.nodeValue = 'oog_lightbox_photo';
    var img_tag_src = document.createAttribute('src');
    img_tag_src.nodeValue = '';
    var img_tag_border = document.createAttribute('border');
    img_tag_border.nodeValue = '0px';
    img_tag.setAttributeNode(img_tag_id);
    img_tag.setAttributeNode(img_tag_src);
    img_tag.setAttributeNode(img_tag_border);
    document.getElementById('oog_lightbox_photo_wrapper').appendChild(img_tag);

    // resizelightbox() needs this for accessing height & width of photo element //
    lightbox_photo = document.getElementById('oog_lightbox_photo');
 
    lightbox_img = new Image();
    lightbox_img.onload = function() {
    // loading photo done //

      // take original dimensions (resizelightbox() needs them) //
      firstimgheight = lightbox_img.height;
      firstimgwidth = lightbox_img.width;

      // resize before file will be visible //
      resizelightbox();
            
      // hide loading //
      $('#oog_lightbox_loading').fadeOut(fadeInOut_loading, function() {
        lightbox_loading.style.visibility = 'hidden';
      });

      // make lightbox visible //
      $('#oog_lightbox_main').fadeOut(0);
      lightbox_main.style.visibility = 'visible';
      document.getElementById('oog_lightbox_photo_box').style.display = 'block'; //for IE7
      $('#oog_lightbox_main').fadeIn(fadeInOut_file, function() {

        // display description //
        display_filedescription();
        
        // if slideshow is active //
        if(lightbox_slideshow == 1) lightbox_timeout = window.setTimeout('next()', timeout_slideshow);                                                                                         

      });

    }

    // insert photo source to load //
    lightbox_img.src = oogLightboxRequests + 'stream&album=' + escape(oog_album) + '&file=' + escape(oog_photoname);
    lightbox_photo.src = oogLightboxRequests + 'stream&album=' + escape(oog_album) + '&file=' + escape(oog_photoname);
    
  } else if(mediafile_extension == 'flv' || mediafile_extension == 'mp4') {
  // if have to load a video //
  
    // insert a element for videoplayer (flowplayer) into the filewrapper //
    var player = document.createElement('a');
    var player_id = document.createAttribute('id');
    player_id.nodeValue = 'player';
    player.setAttributeNode(player_id);
    var player_style = document.createAttribute('style');
    player_style.nodeValue = 'width: 1px; height: 1px; display: block; margin-left: 14px;';
    player.setAttributeNode(player_style);
    document.getElementById('oog_lightbox_photo_wrapper').appendChild(player);

    // set lightbox visible or onMetaData event will not fire //
    lightbox_main.style.visibility = 'visible';
    document.getElementById('oog_lightbox_photo_box').style.display = 'block'; //for IE7
    $('#oog_lightbox_main').fadeIn(0);
    // we can hide lightbox by this: //
    $('#oog_lightbox_main').css('opacity', '0');    ///////////////////////////////////////////////// have to find solution!!
    
    // load/init flowplayer //
    flowplayer('player', {src: flowplayer_swf, wmode: 'window'},{
      clip: {
        autoPlay: true,
        autoBuffering: true,
        onMetaData: function(clip) {
        // loading/initing flowplayer done //

          // resizelightbox() needs this for accessing height & width of flowplayer //
          flowplayer_video = this.getParent();
          
          flpl = this;

          // hide loading //
          $('#oog_lightbox_loading').fadeOut(fadeInOut_loading, function() {
            lightbox_loading.style.visibility = 'hidden';

            // get original dimensions (resizelightbox() needs them) //
            firstimgwidth = clip.metaData.width;
            firstimgheight = clip.metaData.height;
            
            // make lightbox visible //
            $('#oog_lightbox_main').css('opacity', '1');    ///////////////////////////////////////////////// have to find solution!!

            resizelightbox();
  
          });
          
        },
        onFinish: function() {
        
          if(lightbox_slideshow == 1) next();
          
        },          
        url: escape(oogLightboxRequests + 'stream&album=' + oog_album + '&file=' + oog_photoname),
        scaling: "fit" 
      }
    });

  } else if(mediafile_extension == 'mp3') {
  // have to load an audio //

    // insert div element for audioplayer (flowplayer) into the filewrapper //
    var player = document.createElement('div');
    var player_href = document.createAttribute('href');
    player_href.nodeValue = oogLightboxRequests + 'read&album=' + escape(oog_album) + '&file=' + escape(oog_photoname);  
    player.setAttributeNode(player_href);
    var player_id = document.createAttribute('id');
    player_id.nodeValue = 'player';
    player.setAttributeNode(player_id);
    var player_style = document.createAttribute('style');
    player_style.nodeValue = 'width: 1px; height: 1px; display: block; margin-left: 14px;';
    player.setAttributeNode(player_style);
    document.getElementById('oog_lightbox_photo_wrapper').appendChild(player);

    // set following or onMetaData event will not fire //
    lightbox_main.style.visibility = 'visible';
    document.getElementById('oog_lightbox_photo_box').style.display = 'block'; //for IE7
    $('#oog_lightbox_main').fadeIn(0);
    // we can hide lightbox by this: //
    $('#oog_lightbox_main').css('opacity', '0');    ///////////////////////////////////////////////// have to find solution!!
    
    // load/init flowplayer //
    flowplayer('player', {src: flowplayer_swf, wmode: 'window'},{
      plugins: {  
        controls: {  
          fullscreen: false,
          height: 40  
        }  
      },
      clip: {
        autoPlay: true,
        onStart: function(clip) {
        // loading/initing flowplayer done //

          // resizelightbox() needs this for accessing height & width of flowplayer //
          flowplayer_video = this.getParent();
          
          flpl = this; 

          // hide loading //
          $('#oog_lightbox_loading').fadeOut(fadeInOut_loading, function() {
            lightbox_loading.style.visibility = 'hidden';

            // set dimensions (resizelightbox() needs them) //
            firstimgwidth = 800;
            firstimgheight = 100;
            
            // make lightbox visible //
            $('#oog_lightbox_main').css('opacity', '1');    ///////////////////////////////////////////////// have to find solution!!
            
            resizelightbox();
  
          });
          
        },
        onFinish: function() {
        
          if(lightbox_slideshow == 1) next();
          
        },          
        url: escape(oogLightboxRequests + 'stream&album=' + oog_album + '&file=' + oog_photoname),
        scaling: "fit" 
      }
    });

  } else {
  
    alert('Error: Unknown Format');
    exitlightbox();
  
  }

}

/* 
 * START LIGHTBOX
 *
 * Have to be called if you want to show a file with Lightbox. 
 *
 * Parameter: 
 * String  albumpath  (path to album. format: '../albums/[somePath]/')
 * String  photoname  (filename to show in lightbox including extension)
 * Boolean  descEditable  (makes description editable)
 * Boolean  focusDesc  (focus the description.)    
 *                    
 * Returns: -  
 */     	
function startlightbox(albumpath, photoname, descEditable, focusDesc) {


  if(photoname == 'startSlideshow') {
    lightbox_slideshow = 1;
    photoname = document.getElementsByName('thumb')[0].title;  
  }
  if(lightbox_slideshow == 1) lightbox_timeout = null;


  // init onresize event //
  window.onresize = function() {
    if(document.getElementById('oog_lightbox_main').style.visibility == 'visible') resizelightbox();
  }
  
  // init onkeydown event //
  window.document.onkeydown = function(event)  { 
    if(!event) event = window.event; 
    var keycode = event.which || event.keyCode; 
  
    // left arrowkey //
    if(keycode==37 && document.getElementById('oog_lightbox_main').style.visibility=='visible' && !descriptionFocused) previous();
    // right arrowkey //
    if(keycode==39 && document.getElementById('oog_lightbox_main').style.visibility=='visible' && !descriptionFocused) next();
    // esc //
    if(keycode==27) exitlightbox();

  }

  // init original dimensions //
  firstimgwidth = 0;
  firstimgheight = 0;

  // make some parameters global //
  oog_album = albumpath;
  oog_photoname = photoname;
  if(descEditable) {
    descriptionEditable = true;
  } else {
    descriptionEditable = false;
  }
  if(focusDesc && descEditable) {
    focusDescription = true;
  } else {
    focusDescription = false;
  }

  // get extension of file //
  mediafile_extension = oog_photoname.substring(oog_photoname.lastIndexOf('.') + 1, oog_photoname.length).toLowerCase();

  //mediafile_extension = oog_photoname.split('.').pop().toLowerCase();

  // if a file is displayed at this moment //
  if(document.getElementById('oog_lightbox_main').style.visibility == 'visible') {

    // hide lightbox, means the file & buttons and then start loading //
    $('#oog_lightbox_main').fadeOut(fadeInOut_file, function() {
      lightbox_main.style.visibility = 'hidden';
      document.getElementById('oog_lightbox_photo_box').style.display = 'none'; //for IE7
      document.getElementById('oog_lightbox_photo_wrapper').innerHTML = '';
      document.getElementById('oog_lightbox_filedescription').innerHTML = '';

      // start loading file //
      load_media();

    });

  } else {
  // normal: no file is displayed //
  
    // make overlay visible //
    lightbox_overlay.style.width = '100%';
    lightbox_overlay.style.height = '100%';
    $('#oog_lightbox_overlay').fadeOut(0);
    lightbox_overlay.style.visibility = 'visible';
    $('#oog_lightbox_overlay').fadeIn(fadeInOut_overlay);
    
    // start loading file //
    load_media();
    
  }

}

/* 
 * EXIT LIGHTBOX
 *
 * 
 *
 * Parameter: -                    
 * Returns: -  
 */     	
function exitlightbox() {

  // clear slideshow timeout and set slideshow off //
  if(lightbox_slideshow == 1) {
    window.clearTimeout(lightbox_timeout);
    lightbox_slideshow = 0;
  }

  // cancle current loading //
  if(mediafile_extension == 'jpg' || mediafile_extension == 'jpeg' || mediafile_extension == 'gif' || mediafile_extension == 'png') {
    lightbox_img.onload = null;
    lightbox_img.src = null;
    if(self.stop) { 
      window.stop(); 
    } else if(document.execCommand) { 
      document.execCommand('Stop'); 
    }
  } else if(mediafile_extension == 'flv' || mediafile_extension == 'mp3' || mediafile_extension == 'mp4') {
    try { flpl.stop(); } catch(e) {}
    try { flpl.stopBuffering(); } catch(e) {}
  }

  $('#oog_lightbox_extended_box').css('display', 'none');

  // hide loading //
  $('#oog_lightbox_loading').fadeOut(fadeInOut_loading, function() {
    lightbox_loading.style.visibility = 'hidden';
  });

  // hide lightbox //
  $('#oog_lightbox_main').fadeOut(fadeInOut_file, function() {
    lightbox_main.style.visibility = 'hidden';
    document.getElementById('oog_lightbox_photo_box').style.display = 'none'; //for IE7
    document.getElementById('oog_lightbox_photo_wrapper').innerHTML = '';
    document.getElementById('oog_lightbox_filedescription').innerHTML = '';
  });

  // restore document title //
  document.title = lightbox_firsttitle;

  // hide overlay //
  $('#oog_lightbox_overlay').fadeOut(fadeInOut_overlay, function() {
    lightbox_overlay.style.width = '0px';
    lightbox_overlay.style.height = '0px';
    lightbox_overlay.style.visibility = 'hidden';
  });

}

/* 
 * PREVIOUS
 *
 * Will call startlightbox() with previous mediafile of album as parameter.
 * If there are pages defined it will show previous page when previous file is there.
 *
 * Parameter: -                    
 * Returns: -  
 */     	
function previous() {

  if(mediafile_extension == 'flv' || mediafile_extension == 'mp3' || mediafile_extension == 'mp4') {
    flpl.stop();
    flpl.stopBuffering();
  }

  // find out previousphoto //
  var count = document.getElementsByName('thumb').length;
  for(var i = 0; i < count; i++) {
    if(document.getElementsByName('thumb')[i].title == oog_photoname) {
      if(i == 0) {
        // if there are pages defined //
        if(typeof current_page != 'undefined' && typeof num_pages != 'undefined' && typeof all_thumbs != 'undefined' && typeof max_thumbs != 'undefined') {
          if(current_page != 0) {
            show_page(current_page - 1);
          } else {
            show_page(num_pages-1);
          }
          var previousphoto = document.getElementsByName('thumb')[document.getElementsByName('thumb').length - 1].title;          
        } else {
        // if no pages //
          var previousphoto = document.getElementsByName('thumb')[count-1].title;
        }
      } else {      
        var previousphoto = document.getElementsByName('thumb')[i-1].title;
      }
      break;
    }
  }

  // start presentation of previous file in album //
  startlightbox(oog_album, previousphoto, descriptionEditable, focusDescription);

}

/* 
 * NEXT
 *
 * Will call startlightbox() with next mediafile of album as parameter.
 * If there are pages defined it will show next page when next file is there. 
 *
 * Parameter: -                    
 * Returns: -  
 */     	
function next() {

  if(mediafile_extension == 'flv' || mediafile_extension == 'mp3' || mediafile_extension == 'mp4') {
    flpl.stop();
    flpl.stopBuffering();
  }

  // find out nextphoto //
  var count = document.getElementsByName('thumb').length;
  for(var i = 0; i < count; i++) {
    if(document.getElementsByName('thumb')[i].title == oog_photoname) {
      if(i == count - 1) {
        // if there are pages defined //
        if(typeof current_page != 'undefined' && typeof num_pages != 'undefined' && typeof all_thumbs != 'undefined' && typeof max_thumbs != 'undefined') {
          if(current_page != num_pages-1) {
            show_page(current_page + 1);
          } else {
            show_page(0);
          }
          var nextphoto = document.getElementsByName('thumb')[0].title;          
        } else {
        // if no pages //
          var nextphoto = document.getElementsByName('thumb')[0].title;
        }
      } else {
        var nextphoto = document.getElementsByName('thumb')[i+1].title;
      }
      break;
    }
  }

  // start presentation of next file in album //
  startlightbox(oog_album, nextphoto, descriptionEditable, focusDescription);

}

function save_file() {
  
  window.location.href = oogLightboxRequests + 'stream&album=' + escape(oog_album) + '&file=' + escape(oog_photoname);
  
}

/* 
 * DISPLAY FILE DESCRIPTION
 *
 * Sends a get_filedescription request. 
 * Needs global vars oog_album and oog_photoname!
 * Will display description if exists.  
 *
 * Parameter: -                    
 * Returns: -   
 */     	
function display_filedescription() {

  // define ajax_request to get filedescription //
  var filedescription_request = false;
  filedescription_request = new XMLHttpRequest();
  filedescription_request.onreadystatechange = function() {
    if(filedescription_request.readyState == 4) {
      if(filedescription_request.status == 200) {
        
        if(descriptionEditable) {
          document.getElementById('oog_lightbox_filedescription').contentEditable = 'true';
          $('#oog_lightbox_filedescription').css('cursor', 'text');
        } else {
          document.getElementById('oog_lightbox_filedescription').contentEditable = 'false';
          $('#oog_lightbox_filedescription').css('cursor', 'default');
        }

        $('#oog_lightbox_filedescription').text(filedescription_request.responseText);

        if(filedescription_request.responseText == '' || filedescription_request.responseText == '<br>' || filedescription_request.responseText == '<br />' || filedescription_request.responseText == '<br/>') {
          document.getElementById('oog_lightbox_filedescription').style.height = '0px';
          document.getElementById('oog_lightbox_filedescription').innerHTML = '';
          isDescription = false;
        } else {
          document.getElementById('oog_lightbox_filedescription').style.height = '';
          isDescription = true;
        }

        resizelightbox();
                
        if(descriptionEditable) {
         
          var div = document.getElementById('oog_lightbox_filedescription');
          
          div.onfocus = function() {
            window.setTimeout(function() {

              if($('#oog_lightbox_filedescription').text() == '' && !descriptionFocused) $('#oog_lightbox_filedescription').text('Write some text in here..');

              descriptionFocused = true;

              isDescription = true;
              resizelightbox();
              
              document.getElementById('oog_lightbox_filedescription').style.height = '';
              
              var sel, range;
              if (window.getSelection && document.createRange) {
                range = document.createRange();
                range.selectNodeContents(div);
                sel = window.getSelection();
                sel.removeAllRanges();
                sel.addRange(range);
              } else if (document.body.createTextRange) {
                range = document.body.createTextRange();
                range.moveToElementText(div);
                range.select();
              }
                  
            }, 5);
          };
          
          div.onblur = function() {
            window.setTimeout(function() {
              
              descriptionFocused = false;

              save_filedescription($('#oog_lightbox_filedescription').text());
              
              if(document.getElementById('oog_lightbox_filedescription').innerHTML == '<br>' || document.getElementById('oog_lightbox_filedescription').innerHTML == '<br />' || document.getElementById('oog_lightbox_filedescription').innerHTML == '<br/>') {
                document.getElementById('oog_lightbox_filedescription').innerHTML = '';
                document.getElementById('oog_lightbox_filedescription').style.height = '0px';
                isDescription = false;
              } else {
                document.getElementById('oog_lightbox_filedescription').style.height = '';
                isDescription = true;
              }
              
              resizelightbox();

            }, 5);
          
          };

          $('#oog_lightbox_filedescription').live('keyup paste', function() {

            save_filedescription($('#oog_lightbox_filedescription').text());

          });
                                    
          if(focusDescription) div.focus();
      
        }
        
      }      
    }
  }
  
  // send get filedescription request //
  filedescription_request.open('GET', oogLightboxRequests + 'get_filedescription&album=' + escape(oog_album) + '&file=' + escape(oog_photoname), true);
  filedescription_request.send(null);

}

/* 
 * SAVE FILE DESCRIPTION
 *
 * Sends a save_filedescription request.
 * Needs global vars oog_album and oog_photoname!   
 *
 * Parameter: -                     
 * Returns: -     
 */     	  
function save_filedescription(description) {
  
  // define ajax_request to save filedescription //
  var save_filedescription_request = false;
  save_filedescription_request = new XMLHttpRequest();
  save_filedescription_request.onreadystatechange = function() {
    if(save_filedescription_request.readyState == 4) {
      if(save_filedescription_request.status == 200) {

        // if saving description faild show error msg //
        if(save_filedescription_request.responseText != 'succeed') {
          if(show_error_filedescription) alert(save_filedescription_request.responseText);
          show_error_filedescription = false;
          setTimeout(function () { show_error_filedescription = true; }, 3000);
        }
                
      }      
    }
  }

  // send save filedescription request //
  save_filedescription_request.open('GET', oogLightboxRequests + 'save_filedescription&album=' + escape(oog_album) + '&file=' + escape(oog_photoname) + '&description=' + escape(description), true);
  save_filedescription_request.send(null);

}

function refresh_lightbox_extended_box(command, resize) {
  
  if(!command) { command = ''; }
  
  var http_request = false;
  try {
    http_request = new XMLHttpRequest();
  } catch(e) {
    alert('Error: Can not create XMLHttpRequest');
    return false;
  }

  http_request.onreadystatechange = function() {

    if(http_request.readyState == 4) {
      if(http_request.status == 200) {
        document.getElementById('oog_lightbox_extended_box_request').innerHTML = http_request.responseText;
      } else {
        http_request = false;
        alert('Error: Can not load data. Reload page and try again.');
        lightbox_extended = '';        
  $('#oog_lightbox_extended_box').css('display', 'none');
        resizelightbox();
        return false;
      }
    }

  }

  if(command == 'exif' || command == 'comments') {

    if(lightbox_extended == command) {

      lightbox_extended = '';
  $('#oog_lightbox_extended_box').css('display', 'none');
      if(resize) {
        resizelightbox();
      }
      return false;

    }

    lightbox_extended = command;
  $('#oog_lightbox_extended_box').css('display', 'block');

    http_request.open('GET', oogLightboxRequests + command + '&album=' + escape(oog_album) + '&file=' + escape(oog_photoname), true);
    http_request.send(null);

  } else {

    if(lightbox_extended != '') {
    
  $('#oog_lightbox_extended_box').css('display', 'block');

      http_request.open('GET', oogLightboxRequests + lightbox_extended + '&album=' + escape(oog_album) + '&file=' + escape(oog_photoname), true);
      http_request.send(null);

    }

  }

  if(resize) {
    resizelightbox();
  }

}

function slideshow() {

  if(lightbox_slideshow == 0) {
  
    if(mediafile_extension == 'jpg' || mediafile_extension == 'jpeg' || mediafile_extension == 'gif' || mediafile_extension == 'png')
      lightbox_timeout = window.setTimeout('next()',timeout_slideshow);

    document.getElementById('oog_lightbox_slideshow_but').style.backgroundPosition = '-17px -17px';
    
    lightbox_slideshow = 1;

  } else {

    document.getElementById('oog_lightbox_slideshow_but').style.backgroundPosition = '-17px 0px';

    window.clearTimeout(lightbox_timeout);
    
    lightbox_slideshow = 0;

  }

}