window.onload=function() {
   if(!document.getElementById) { alert('Для корректной работы обновите браузер.'); return false; }
   var ColH=300;
   var el=document.getElementById('cleft');
   ColH=ColH>el.offsetHeight?ColH:el.offsetHeight;
   if(document.getElementById('ccont')) {
	   var er=document.getElementById('cright');
	   ColH=ColH>er.offsetHeight?ColH:er.offsetHeight;
	   var ec=document.getElementById('ccont');
	   ColH=ColH>ec.offsetHeight?ColH:ec.offsetHeight;
   	er.style.height=ColH+'px';
   } else if(document.getElementById('ccont2')) {
	   var ec=document.getElementById('ccont2');
	   ColH=ColH>ec.offsetHeight?ColH:ec.offsetHeight;
	} else { return false; }
   el.style.height=ColH+'px';
   ec.style.height=ColH+'px';
   return true;
}