(document.getElementById) ? dom = true : dom = false;
function placeIt() {
//  document.all('adv').style.posLeft = (document.body.clientWidth/2) - (adv.offsetWidth/2);
//  document.all('adv').style.posTop = (document.body.clientHeight/2) - (adv.offsetHeight/2);

	var x,y;
	if (self.pageYOffset) // all except Explorer
	{
		x = self.pageXOffset;
		y = self.pageYOffset;
	}
	else if (document.documentElement && document.documentElement.scrollTop)
		// Explorer 6 Strict
	{
		x = document.documentElement.scrollLeft;
		y = document.documentElement.scrollTop;
	}
	else if (document.body) // all other Explorers
	{
		x = document.body.scrollLeft;
		y = document.body.scrollTop;
	}
	
//	document.getElementById('adv').style.posLeft = 10;
//	document.getElementById('adv').style.posTop = y + 10 ;
	document.getElementById('adv').style.left = 10;
	document.getElementById('adv').style.top = y + 10 ;
	
//	alert('End ' + y);
	window.setTimeout("placeIt()", 100);
}

function hideIt() {
  if (dom) {document.getElementById("adv").style.visibility='hidden';}
  if (document.layers) {document.layers["adv"].visibility='hide';}
}

function showIt() {
  if (dom) {document.getElementById("adv").style.visibility='visible';}
  if (document.layers) {document.layers["adv"].visibility='show';} 
}