function popup(Ziel, Breite, Hoehe) {
	Position_X = (screen.width - Breite)/2;
	Position_Y = (screen.height - Hoehe)/2;

	Datum = new Date();
	Name = Datum.getDate();
	
	void(window.open(Ziel, Name, 'width='+Breite+', height='+Hoehe+', left='+Position_X+', top='+Position_Y+', scrollbars=yes'));
}