function OpenCenterPopup(URL, winName, W, H, prop)
	{
		var w=screen.width;
		var h=screen.height;
		var x=parseInt((w-W)/2);
		var y=parseInt((h-H)/2);
		window.open(URL,winName,'width=' + W + ',height=' + H + ',left=' + x + ',top=' + y + prop);
	}