if (document.images)
   {
     home1on= new Image(51,28);
     home1on.src="images/navigationbuttons/home2.gif";

     aktuelle_bauvorhaben1on= new Image(150,28);
     aktuelle_bauvorhaben1on.src="images/navigationbuttons/aktuelle_bauvorhaben2.gif";

     referenzobjekte1on= new Image(114,28);
     referenzobjekte1on.src="images/navigationbuttons/referenzobjekte2.gif";

     ueber_uns1on= new Image(70,28);
     ueber_uns1on.src="images/navigationbuttons/ueber_uns2.gif";

     leben_in_freiburg1on= new Image(66,28);
     leben_in_freiburg1on.src="images/navigationbuttons/leben_in_freiburg2.gif";

     finanzrechner1on= new Image(102,28);
     finanzrechner1on.src="images/navigationbuttons/finanzrechner2.gif";

     presse1on= new Image(56,28);
     presse1on.src="images/navigationbuttons/presse2.gif";

     kontakt1on= new Image(63,28);
     kontakt1on.src="images/navigationbuttons/kontakt2.gif";

     impressum1on= new Image(83,28);
     impressum1on.src="images/navigationbuttons/impressum2.gif";




     home1off= new Image(51,28);
     home1off.src="images/navigationbuttons/home1.gif";

     aktuelle_bauvorhaben1off= new Image(150,28);
     aktuelle_bauvorhaben1off.src="images/navigationbuttons/aktuelle_bauvorhaben1.gif";

     referenzobjekte1off= new Image(114,28);
     referenzobjekte1off.src="images/navigationbuttons/referenzobjekte1.gif";

     ueber_uns1off= new Image(70,28);
     ueber_uns1off.src="images/navigationbuttons/ueber_uns1.gif";

     leben_in_freiburg1off= new Image(66,28);
     leben_in_freiburg1off.src="images/navigationbuttons/leben_in_freiburg1.gif";

     finanzrechner1off= new Image(102,28);
     finanzrechner1off.src="images/navigationbuttons/finanzrechner1.gif";

     presse1off= new Image(56,28);
     presse1off.src="images/navigationbuttons/presse1.gif";

     kontakt1off= new Image(63,28);
     kontakt1off.src="images/navigationbuttons/kontakt1.gif";

     impressum1off= new Image(83,28);
     impressum1off.src="images/navigationbuttons/impressum1.gif";

   }

function lightup(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }