function showImageMedia(url, mediaTitle) {
  Shadowbox.open({
        content:      url,
        player:       'img',
        title:        mediaTitle
  });
}

function showVideoMedia(url, mediaTitle, mediaWidth, mediaHeight) {
  Shadowbox.open({
        content:    url,
        player:     'flv',
        title:      mediaTitle,
        width:      mediaWidth,
        height:     mediaHeight
  }); 
}