function WinOpen(url, caption, breite, hoehe) {
	links=(screen.width - breite) / 2;
	oben=(screen.height - hoehe) / 2;
	if (links <= 0) links = 10;
	if (oben <= 0) oben = 10;
	fenster = window.open(url, caption, "top=" + oben + ",left=" + links + ", height=" + hoehe + ",width=" + breite + ",status=no, toolbar=no, location=no, resizable=yes, titlebar=no, fullscreen=no");
    fenster.focus();
}