function popup(mylink, windowname) {
	if (document.all)
		var xMax = screen.width, yMax= screen.height;
	else
		if (document.layers)
			var xMax = window.outerWidth, yMax = window.outerHeight;
		else
			var xMax = 1024, yMax = 768;
	var xOffset = (xMax - 1000)/2, yOffset = (yMax - 400)/2;
	
	if (! window.focus)return true;
	var href;
	if (typeof(mylink) == 'string')
	   	href=mylink;
	else
	   	href=mylink.href;
		window.open(href, windowname, 'width=640,height=426,toolbar=no,scrollbars=no,location=no,status=no,screenX='+xOffset+',screenY='+yOffset+',left='+xOffset+',top='+yOffset+'');
	return false;
}