window.onload = function(){

var cont = document.getElementById('main_content');
	var x = cont.offsetHeight;		
	var lefy = document.getElementById('side');
	lefy.style.height = 'auto';
	var lx = lefy.offsetHeight;		
	if(lx < x)
	{
		lefy.style.height = x - 12 +"px";
	}


var cont = document.getElementById('main_content');
	var x = cont.offsetHeight;		
	var lefy = document.getElementById('side2');
	lefy.style.height = 'auto';
	var lx = lefy.offsetHeight;		
	if(lx < x)
	{
		lefy.style.height = x - 12 +"px";
	}
}