function openCustomWindow(url, width, height, winName)	{
	var width=width;
	var height=height;
	var left=(screen.availWidth - width) / 2;
	var top=(screen.availHeight - height) / 2;
	window.open(url, winName, 'top=' + top + ', left=' + left + ', scrollbars=yes,resizable=yes,toolbar=no,location=no,width='+width+',height='+height+'');
}