function maxHeight(){

var max_height = Math.max( document.getElementById("alpha").offsetHeight , document.getElementById("beta").offsetHeight  ) ;
max_height = Math.max( max_height , document.getElementById("gamma").offsetHeight  ) ;

//alert(max_height) ;

max_height = max_height + "px" ;
	
	 document.getElementById("alpha").style.height = max_height ;
	 document.getElementById("beta").style.height = max_height ;
	 document.getElementById("gamma").style.height = max_height ;	
	
}

function addEvent(elm,listener,fn){
		try{
			elm.addEventListener(listener,fn,false);
		}catch(e){
			elm.attachEvent("on"+listener,fn);
		}
	}
	addEvent(window,"load",maxHeight);