function setHeights() {
 c=document.getElementById('content');
 l=document.getElementById('left');
 cn=document.getElementById('center');
 r=document.getElementById('right');
 
 var maxHeight = 0;
 
 maxHeight = Math.max(maxHeight,l.offsetHeight);
 maxHeight = Math.max(maxHeight,cn.offsetHeight);
 maxHeight = Math.max(maxHeight,r.offsetHeight);
 
 l.style.height = (maxHeight+"px");
 cn.style.height = (maxHeight+"px");
 r.style.height = (maxHeight+"px");
}