function openInCenter(theURL) {
	var needed_width = 778;
	var needed_height = 500;

	var X = ((screen.width/2)-(needed_width/2));
	var Y = ((screen.height/2)-(needed_height/2));

	var myparams = "innerWidth=" + needed_width + ",innerHeight=" + needed_height + ",width=" + needed_width + ",height=" + needed_height + ",left=" + X + ",top=" + Y + ",screenX=" + X + ",screenY=" + Y;

	myparams += ",alwaysLowered=0,alwaysRaised=1,channelmode=0,dependent=0,directories=0,fullscreen=0,hotkeys=1,location=0,menubar=0,noresize=1,scrollbars=0,status=0,titlebar=0,toolbar=0";

	centerwindow=window.open(theURL,"horeca",myparams);
	centerwindow.focus();
}