function ScrSize() {
	var hgtleft = document.getElementById("nav2").offsetHeight;
	var hgtright = document.getElementById("nav3").offsetHeight;
	var hgtcent = document.getElementById("content").offsetHeight;
	var hgtnb = document.getElementById("nav1").offsetHeight;

	if (hgtcent > hgtleft && hgtcent > hgtright){
		var top1 = document.getElementById("content").offsetTop;
		var hgt1 = hgtcent + 18;
	}
	else if (hgtleft > hgtright){
		var top1 = document.getElementById("nav2").offsetTop + 18;
		var hgt1 = hgtleft + 18;
	}
	else {
		var top1 = document.getElementById("nav3").offsetTop + 18;
		var hgt1 = hgtright + 18;
	}
	document.getElementById("nav2").style.height = hgt1 + 'px';
	document.getElementById("nav3").style.height = hgt1 + 'px';
	document.getElementById("footer").style.top = (hgt1 + top1) + 'px';
}