//Funtion originally created at maratz.com. Modified by Tim Hettler (timhettler.com)
function backToTop() {
	var d = document;
	var viewport_height = (self.innerHeight) ? self.innerHeight : (document.getElement && document.documentElement.clientHeight) ? document.documentElement.clientHeight : (document.body) ? document.body.clientHeight : 0;
	var page_height = d.getElementsByTagName('body')[0].offsetHeight-50;
	if(page_height > viewport_height) {
		var elem = d.getElementById("maincontent");
		var div = document.createElement("div");
		div.setAttribute("id","totop");
		var a = document.createElement("a");
		a.setAttribute("href","#maincontent");
		a.appendChild(document.createTextNode("top of page"));
		div.appendChild(a);
		document.getElementById("rightcol").appendChild(div);
	}
}

addLoadEvent(backToTop);