//vh() make the Left-Panel and Right-Panel with the same height;
function vh(a,el){
		var b = document.getElementById(a[0]).scrollHeight;
		for (i=0; i<a.length; i++){
			if(b < document.getElementById(a[i]).scrollHeight){
			   b = document.getElementById(a[i]).scrollHeight;
			}
		}
		for (i=0; i<a.length; i++){
			document.getElementById(a[i]).style.height = b+el+"px";
		}
	}
window.onload = function(){
	vh(['col1','col2','col3'],-1);
	}