if (document.images)
   {
     pic1on= new Image(83,22);
     pic1on.src="/img/nav_home_on.gif";  
     pic2on= new Image(94,22);
     pic2on.src="/img/nav_services_on.gif";  
     pic3on= new Image(170,22);
     pic3on.src="/img/nav_betaling_on.gif";  
     pic4on= new Image(130,22);
     pic4on.src="/img/nav_voorwaarden_on.gif";  
     pic5on= new Image(93,22);
     pic5on.src="/img/nav_contact_on.gif"; 
     pic6on= new Image(93,22);
     pic6on.src="/img/nav_chauffeurs_on.gif"; 

     pic1off= new Image(83,22);
     pic1off.src="/img/nav_home_off.gif";
     pic2off= new Image(94,22);
     pic2off.src="/img/nav_services_off.gif";
     pic3off= new Image(170,22);
     pic3off.src="/img/nav_betaling_off.gif";  
     pic4off= new Image(130,22);
     pic4off.src="/img/nav_voorwaarden_off.gif";  
     pic5off= new Image(93,22);
     pic5off.src="/img/nav_contact_off.gif";
     pic6off= new Image(93,22);
     pic6off.src="/img/nav_chauffeurs_off.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;
    }
 }