function levelHeight() {

	var list1 = document.getElementById('List1');
	var list2 = document.getElementById('List2');
	var list3 = document.getElementById('List3');

	var heights = new Array();
	var max = 0;

	list1.style.minHeight = "0px";
	list2.style.minHeight = "0px";

	heights['l1'] = list1.offsetHeight + list1.offsetTop;
	heights['l2'] = list2.offsetHeight + list2.offsetTop;
	heights['l3'] = list3.offsetHeight + list3.offsetTop;

	max = Math.max(heights['l1'],heights['l2']);
	max = Math.max(max, heights['l3']);

	list1.style.minHeight = (max - list1.offsetTop) + "px";
	list2.style.minHeight = (max - list2.offsetTop) + "px";
}