function HeightCheck() {
	var Box1 = document.getElementById('LeftNav');
	var Box2 = document.getElementById('ContentBox');
	var Box3 = document.getElementById('RightNav');
	
	Box1.style.height = (Box2.offsetHeight + 3) +"px";
	Box3.style.height = (Box2.offsetHeight + 2) +"px";
}