var fenster = null;


function openWindow(URL,winName,breite,hoehe,scrolling) { 
       if(navigator.platform=="Win32"){if (fenster){if(fenster.close) {fenster.close(); }}}
       xpos=(screen.width-breite-12)/2;
       ypos=(screen.height-hoehe-40-30)/2;
       fensterhoehe=hoehe+22;
       features='toolbar=no,location=no,directories=no,status=no,scrollbars='+scrolling+',resizable=no,menubar=no,';
       features=features+'width='+breite+',height='+fensterhoehe+',screenX='+xpos+',screenY='+ypos+',left='+xpos+',top='+ypos;
       fenster=window.open(URL,winName,features);
//       fenster.moveTo(xpos,ypos); 
       fenster.focus()

}