function openwindow(dateiname, fenstername, breite, hoehe)
{
	/*hoehe = 550;
	breite = 880;*/
	fenster = window.open(dateiname,fenstername,'location=no,resizable=yes,toolbar=no,width=' + breite + ',height=' + hoehe + ',directories=no,scrollbars=yes,resize=no,menubar=no,status=yes');
	fenster_offen = "true";
	if ( parseInt(navigator.appVersion.substring(0,1)) >= 4 )
	{
		links = (screen.availWidth - parseInt(breite))-20 ;
		rechts = (screen.availHeight - parseInt(hoehe)) / 2;
		fenster.moveTo(links,10);
		fenster.focus();
		if ((screen.availWidth - eval(breite)) <=30 ) { fenstername.screenX = 1 };
	};
	return;
}