function popup(url,text,breite,hoehe)
{
 if((navigator.appName == "Netscape") && ((parseInt(navigator.appVersion)) >= 3)) 
 {	
   display_window= window.open(url,text,"screenx=700,screeny=350,width="+breite+",height="+hoehe+",dependent=yes,resizable=yes,scrollbars=yes"); display_window.focus();
 }
 else 
 {
  display_window = window.open(url,text,'screenx=700,screeny=350,width='+breite+',height='+hoehe+',dependent=yes,resizable=yes,scrollbars=yes');

  display_window.close();

  if (display_window.closed != true) 
  {
    display_window.close();
  };

  display_window = window.open(url, text, 'screenx=700,screeny=350,width='+breite+',height='+hoehe+',dependent=yes,resizable=yes,scrollbars=yes');
 }	
}