function popup(Adresse, Breite, Hoehe) {
	var Links = (screen.width-Breite)/2;
	var Oben = (screen.height-Hoehe)/2;
	
	var Datum = new Date();
	var Name = Datum.getTime();
	
	void(window.open(Adresse, Name, 'width='+Breite+', height='+Hoehe+', left='+Links+', top='+Oben+', scrollbars=yes'));
}