function centerAlertLayer()
{
	leftpix = 180;
	NS6=false;
	IE4=(document.all);
	if (!IE4) {NS6=(document.getElementById);}
	NS4=(document.layers);

	Params = overlaySize();

	if (NS4) {
		document.layers['alertLayer'].pageX = window.innerWidth/2-leftpix;
		document.layers['alertLayer'].pageY = 250;
		document.layers['alertLayer'].visibility = 'visible';
		document.layers['alertOverlay'].visibility = 'visible';
		document.layers['alertOverlay'].width = Params[0];
		document.layers['alertOverlay'].height = Params[1];
	}
	if (NS6) {
		document.getElementById('alertLayer').style.left = window.innerWidth/2-leftpix+'px';
		document.getElementById('alertLayer').style.top = 250+'px';
		document.getElementById('alertLayer').style.visibility = 'visible';
		document.getElementById('alertOverlay').style.visibility = 'visible';
		document.getElementById('alertOverlay').style.width = Params[0]+'px';
		document.getElementById('alertOverlay').style.height = Params[1]+'px';
	}
	else if (IE4) {
		document.all['alertLayer'].style.posLeft = document.body.clientWidth/2-leftpix;
		document.all['alertLayer'].style.posTop = 250;
		document.all['alertLayer'].style.visibility = 'visible';
		document.all['alertOverlay'].style.visibility = 'visible';
		document.all['alertOverlay'].style.width = Params[0];
		document.all['alertOverlay'].style.height = Params[1];
	}
}

function closeAlert()
{
	NS6=false;
	IE4=(document.all);
	if (!IE4) {NS6=(document.getElementById);}
	NS4=(document.layers);

	if (NS4) {
		document.layers['alertLayer'].visibility = 'hidden';
		document.layers['alertOverlay'].visibility = 'hidden';
	}
	if (NS6) {
		document.getElementById('alertLayer').style.visibility = 'hidden';
		document.getElementById('alertOverlay').style.visibility = 'hidden';
	}
	else if (IE4) {
		document.all['alertLayer'].style.visibility = 'hidden';
		document.all['alertOverlay'].style.visibility = 'hidden';
	}
}

function overlaySize()
{
	var de = document.documentElement;
	var w = window.innerWidth || self.innerWidth || (de&&de.clientWidth) || document.body.clientWidth;
	var h = window.innerHeight || self.innerHeight || (de&&de.clientHeight) || document.body.clientHeight
	arrayPageSize = new Array(w,h) 
	return arrayPageSize;
}