Hide/Show script is loading hidden content

In Firefox the YouTube videos don't load until you click the expandable link but in Internet Explorer, everything hidden loads first which means the page lags.

http://www.murraysworld.com/video/

Please can someone make it so IE stops doing this?

<!--
function dsp(loc){
   if(document.getElementById){
      var foc=loc.firstChild;

         foc=loc.firstChild.innerHTML?
         loc.firstChild:
         loc.firstChild.nextSibling;

         var th = document.getElementById(loc);
         if(th != null){
           //th.innerHTML=th.innerHTML=='+'?'-':'+';
            foc.innerHTML=foc.innerHTML=='+'?'-':'+';
         }

         foc=loc.parentNode.nextSibling.style?
         loc.parentNode.nextSibling:
         loc.parentNode.nextSibling.nextSibling;
      foc.style.display=foc.style.display=='block'?'none':'block';}}

if(!document.getElementById)
   document.write('<style type="text/css"><!--\n'+
      '.more_content{display:block;}\n'+
      '//--></style>');
//-->

Code (markup):