function new_window_center(winname,breite,hoehe) {
	var links=screen.width/2-breite/2;
	var oben=screen.height/2-hoehe/2;
	NewWin = window.open(winname, "", "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizeable=0,fullscreen=0,width="+breite+",height="+hoehe+",top="+oben+",left="+links);
}