var y1 = 0;
(document.getElementById) ? dom = true : dom = false;

function hideIt() {
	if (dom) {document.getElementById("layer1").style.visibility='hidden';}
}

function showIt() {
	if (dom) {document.getElementById("layer1").style.visibility='visible';}
}

function placeIt() {
	if (dom && !document.all) {document.getElementById("layer1").style.top = "0" + "px";}
	if (document.all) {document.all["layer1"].style.top = document.documentElement.scrollTop + (document.documentElement.clientHeight - (document.documentElement.clientHeight-y1)) + "px";}
	window.setTimeout("placeIt()", 10); }