function neuesfenster(popupURL)
{  sw = (screen.width-626)/2;
   sh = (screen.height-450)/2;
/*var popupURL = "impressum.html"*/
var fenster=window.open(popupURL,"neuesfenster",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=yes,width=626,height=450,left='+sw+',top='+sh+''); 
fenster.focus();
	if( navigator.appName.substring(0,8) == "Netscape" ) 
	{ 
		popup.location = popupURL; 
		popup.opener = self; 
	} 

}