if (document.images)
   {
     pic1on= new Image(30,112);
     pic1on.src="images/overknop_informatie.gif";  
     pic2on= new Image(26,112);
     pic2on.src="images/overknop_arrangement.gif"; 
     pic3on= new Image(26,112);
     pic3on.src="images/overknop_koffietafel.gif"; 
     pic4on= new Image(24,112);
     pic4on.src="images/overknop_buffetten.gif"; 
     pic5on= new Image(28,112);
     pic5on.src="images/overknop_barbeque.gif"; 
     pic6on= new Image(25,112);
     pic6on.src="images/overknop_creatieftafelen.gif";
     pic7on= new Image(25,112);
     pic7on.src="images/overknop_diners.gif"; 
     pic8on= new Image(27,112);
     pic8on.src="images/overknop_route.gif"; 
	 pic9on= new Image(27,112);
     pic9on.src="images/overknop_contact.gif"; 
     pic10on= new Image(62,112);
     pic10on.src="images/overknop_camping.gif"; 

     pic1off= new Image(30,112);
     pic1off.src="images/knop_informatie.gif";
     pic2off= new Image(26,112);
     pic2off.src="images/knop_arrangement.gif";
     pic3off= new Image(26,112);
     pic3off.src="images/knop_koffietafel.gif";
     pic4off= new Image(24,112);
     pic4off.src="images/knop_buffetten.gif";
     pic5off= new Image(28,112);
     pic5off.src="images/knop_barbeque.gif";
     pic6off= new Image(25,112);
     pic6off.src="images/knop_creatieftafelen.gif";
     pic7off= new Image(25,112);
     pic7off.src="images/knop_diners.gif";
     pic8off= new Image(27,112);
     pic8off.src="images/knop_route.gif";
     pic9off= new Image(27,112);
     pic9off.src="images/knop_contact.gif";
     pic10off= new Image(62,112);
     pic10off.src="images/knop_camping.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;
    }
 }