function openWindow(uriParam, name, windowWidth, windowHeight) {
	var uriPrefix;
	var screenWidth;
	var screenHeight;
	var positionX;
	var positionY;
	
	uriPrefix		= "../voucher.popup.php";
	//uriPrefix		= "../voucher.popup.php";
	uri				= uriPrefix+uriParam;

	screenWidth		= screen.width;
	screenHeight	= screen.height;

	positionX		= Math.round(((screenWidth-windowWidth)/2), 0);
	positionY		= Math.round(((screenHeight-windowHeight)/2), 0);

	optional	= "width="+windowWidth+",";
	optional	+= "height="+windowHeight+",";
	optional	+= "top="+positionY+",";
	optional	+= "left="+positionX+",";
	optional	+= "location=no,";
	optional	+= "menubar=no,";
	optional	+= "resizable=no,";
	optional 	+= "scrollbars=no,";
	optional	+= "status=no,";
	optional	+= "toolbar=no";

	window.open(uri, name, optional);
}

function closeWindow() {
	window.close();
}