window.onload = function(){
	var c1 = $("#col1");
	var c2 = $("#col2");
	var c3 = $("#col3");
	var ch1 = $(c1).height();
	var ch2 = $(c2).height();
	var ch3 = $(c3).height();
		
	if(ch1 >= ch2 && ch1 >= ch3){
		$(c2).css("height", ch1);
		$(c3).css("height", ch1);
	}else if(ch2 >= ch1 && ch2 >= ch3){
		$(c1).css("height", ch2);
		$(c3).css("height", ch2);
	}else{
		$(c1).css("height", ch3);
		$(c2).css("height", ch3);
	}
}