var bgWnd = "";
  var myWnd = "";

  function showPopup() {
    browser=(navigator.appName.indexOf("Microsoft")==-1)?"ns":"ie";
    system= (navigator.appVersion.indexOf("Mac")==-1)?"pc":"mac";
    
    breite = screen.availWidth - 10;
    hoehe = screen.availHeight - 28;
    bgProps = "top=0,left=0,width="+breite+",height="+hoehe+",dependant=yes";
		if (bgWnd) bgWnd.close();
		bgWnd = window.open("./index0.htm","bg",bgProps);
		bgWnd.focus();
  }

  function closeAll() {
    if(bgWnd) {
      bgWnd.close();
    }
    if(myWnd) {
      myWnd.close();
    }
  }