function footer() {
	var height = document.getElementById('centerContent').offsetHeight;
	var sheight = 670;
	var margin = 60;
	if ( height > sheight) {
		document.getElementById('centerContent').style.paddingBottom='60px';
		document.getElementById('footer').style.position='fixed';
		document.getElementById('footer').style.bottom='0';
		document.getElementById('footer').style.borderRadius='0';
		document.getElementById('footer').style.MozBorderRadius='0';
		document.getElementById('footer').style.WebkitBorderRadius='0';
		document.getElementById('footer').style.zIndex='999';
	}
}

if (window.attachEvent) {window.attachEvent('onload', footer);}
else if (window.addEventListener) {window.addEventListener('load', footer, false);}
else {document.addEventListener('load', footer, false);}