if (isNS4) {
	var back2top = document["back2top"];
	back2top.top = top.pageYOffset;
	back2top.visibility = "visible";
	moveRightEdge();
} else if (isDOM) {
	var back2top = getRef("back2top");
	back2top.style.top = (isNS ? window.pageYOffset : document.body.scrollTop);
	back2top.style.visibility = "visible";
	moveRightEdge();
}