var orderWindow = null;

function displayOrderWindow ( )
{
	width = 500;
	height = 450;
	
	LeftPosition = ( screen.width ) ? ( screen.width - width ) / 2 : 100;
	TopPosition = ( screen.height ) ? ( screen.height - height ) / 2 : 100;

	settings =
		'width=' + width +
		',height=' + height + 
		',top=' + TopPosition +
		',left=' + LeftPosition + 
		',scrollbars=auto,location=no,directories=no,status=no,menubar=no' +
		',toolbar=no,resizable=yes';
	
	orderWindow = window.open(
		"http://www.tuebinger-phaenomenologie.de/bestellung.html",
		"orderWindow", settings);
}