if (document.images)
   {
     pic1on= new Image(41,26);
     pic1on.src="../admin/images/overknop-home.gif";  
     pic2on= new Image(108,26);
     pic2on.src="../admin/images/overknop-verpakkingen.gif"; 
     pic3on= new Image(77,26);
     pic3on.src="../admin/images/overknop-bedrijven.gif"; 
     pic4on= new Image(123,26);
     pic4on.src="../admin/images/overknop-vraagaanbod.gif"; 
     pic5on= new Image(49,26);
     pic5on.src="../admin/images/overknop-forum.gif"; 
     pic6on= new Image(58,26);
     pic6on.src="../admin/images/overknop-agenda.gif";
     pic7on= new Image(43,26);
     pic7on.src="../admin/images/overknop-links.gif"; 
	 pic8on= new Image(55,26);
     pic8on.src="../admin/images/overknop-zoeken.gif"; 

     pic1off= new Image(41,26);
     pic1off.src="../admin/images/knop-home.gif";
     pic2off= new Image(108,26);
     pic2off.src="../admin/images/knop-verpakkingen.gif";
     pic3off= new Image(77,26);
     pic3off.src="../admin/images/knop-bedrijven.gif";
     pic4off= new Image(123,26);
     pic4off.src="../admin/images/knop-vraagaanbod.gif";
     pic5off= new Image(49,26);
     pic5off.src="../admin/images/knop-forum.gif";
     pic6off= new Image(58,26);
     pic6off.src="../admin/images/knop-agenda.gif";
     pic7off= new Image(43,26);
     pic7off.src="../admin/images/knop-links.gif";
     pic8off= new Image(55,26);
     pic8off.src="../admin/images/knop-zoeken.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;
    }
 }