var a=document.getElementById("contLeft");    
var b=document.getElementById("contRight"); 
var c=document.getElementById("cont"); 
var d=document.getElementById("wrapper");  
var e=document.getElementById("foot");  
if(a.clientHeight<b.clientHeight) {   
  a.style.height=b.clientHeight+"px"; 
  c.style.height=b.clientHeight+"px";
  d.style.height=b.clientHeight+296+e.style.height+"px";
} else{    
  b.style.height=a.clientHeight+"px";  
  c.style.height=a.clientHeight+"px"; 
  d.style.height=a.clientHeight+296+e.style.height+"px";
}