function getElementsByClass(searchClass) {
    var returnArray = [];
    var els = document.getElementsByTagName('*');
    var pattern = new RegExp('(^|\\s)' + searchClass + '(\\s|$)');
    for (var i = 0; i < els.length; i++) {
        if (pattern.test(els[i].className)) {
            returnArray.push(els[i]);
        } 
    } return returnArray;
}

function popVideo(vid, darken) {
    var videos = getElementsByClass('video');     // Get all the videos on the page.  
    var isplaying=null;
    for (i = 0; i < videos.length; i++) {
        if (videos[i].style.display == 'block') {     // This video is playing       
            isplaying = videos[i].id;                   // remember its name      
            var tmp = videos[i].innerHTML;              // Get the division contents      
            videos[i].innerHTML = '';                   // destroy the contents      
            videos[i].style.display = 'none';           // Terminate the video.
            videos[i].innerHTML = tmp;                  // rebuild the contents.    
        } 
    }

    var dark = document.getElementById('darkenScreenObject');
    if (!dark) {
        var tbody = document.getElementsByTagName("body")[0];
        var tnode = document.createElement('div');          // Create the layer.        
        tnode.style.backgroundColor = 'rgb(0, 0, 0)';     // Make it black.        
        tnode.style.opacity = '0.7';                      // Set the opacity (firefox/Opera)        
        tnode.style.MozOpacity = '0.70';                  // Firefox 1.5        
        tnode.style.filter = 'alpha(opacity=70)';         // IE.        
        tnode.style.zIndex = '1';                         // Zindex of 50 so it "floats"       
        tnode.style.position = 'absolute';                // Position absolutely        
        tnode.style.top = '0px';                          // In the top       
        tnode.style.left = '0px';                         // Left corner of the page        
        tnode.style.overflow = 'hidden';                  // Try to avoid making scroll bars           
        tnode.style.display = 'none';                     // Start out Hidden   
        tnode.id = 'darkenScreenObject';                  // Name it so we can find it later 
        tbody.appendChild(tnode);                           // Add it to the web page 
        dark = document.getElementById('darkenScreenObject'); // Get the object.
    }
  dark.style.display='none';  
  if ((isplaying==vid)||(/^close$/i.test(vid))) { 
  return false; 
  }
    if (typeof(vid)=="string") { 
    vid=document.getElementById(vid); 
    }
    if (vid && typeof (vid) == "object") {
        if (darken) {

            if (window.innerHeight && window.scrollMaxY) {
                var pageWidth = window.innerWidth + window.scrollMaxX;
                var pageHeight = window.innerHeight + window.scrollMaxY;
            }
            else if (document.body.scrollHeight > document.body.offsetHeight) {
                var pageWidth = document.body.scrollWidth;
                var pageHeight = document.body.scrollHeight;
            }
            else {
                var pageWidth = document.body.offsetWidth + document.body.offsetLeft;
                var pageHeight = document.body.offsetHeight + document.body.offsetTop;
            }      //set the shader to cover the entire page and make it visible.       
            dark.style.width = pageWidth + 'px';
            dark.style.height = pageHeight + 'px';
            dark.style.display = 'block';
        }
        // Make the video visible and set the zindex so its on top of everything else
        vid.style.zIndex = '100';
        vid.style.display = 'block';
        var scrollTop = 0;
        if (document.documentElement && document.documentElement.scrollTop)
            scrollTop = document.documentElement.scrollTop;
        else if (document.body)
            scrollTop = document.body.scrollTop;    // set the starting x and y position of the video    
        vid.style.top = scrollTop + Math.floor((document.documentElement.clientHeight / 2) - (vid.offsetHeight / 2)) + 'px';
        vid.style.left = Math.floor((document.documentElement.clientWidth / 2) - (vid.offsetWidth / 2)) + 'px';
    }
    return false;
}