function runheight()
{

var intHeight = document.getElementById('cen').scrollHeight;


if (document.getElementById('r') && document.getElementById('l'))
{
document.getElementById('r').style.height =intHeight+"px";
document.getElementById('l').style.height =intHeight+"px";

}
}



function addEvent( obj, type, fn ){ 
   if (obj.addEventListener){ 
	  obj.addEventListener( type, fn, false );
   }
   else if (obj.attachEvent){ 
	  obj["e"+type+fn] = fn; 
	  obj[type+fn] = function(){ obj["e"+type+fn]( window.event ); } 
	  obj.attachEvent( "on"+type, obj[type+fn] ); 
   } 

}

addEvent(window, 'load', runheight);
addEvent(window, 'resize', runheight);