if (document.images) {


  image1on = new Image();
  image1on.src = "studio_on.gif";


  image8on = new Image();
  image8on.src = "offerte_on.gif";
    
  image11on = new Image();
  image11on.src = "spandoeken_on.gif";

  image1off = new Image();
  image1off.src = "studio.gif";

    
  image8off = new Image();
  image8off.src = "offerte.gif";
   
  image11off = new Image();
  image11off.src = "spandoeken_off.gif";
}

function depress(i,release) {
   if (!document.images) return true;
   if (window.focus) window.focus();
   if (release) return false; // do not depress addbookmark or window.open
   if (saveImage != '') {
      document.images[saveImage].src=eval(saveImage+'off.src');
   }
   document.images['image'+i].src= eval('image'+i+'on.src');
   saveImage = 'image'+i;
   return true;
}

saveImage = "";
function changeImages(doc,imgName,img) {
   if (document.images) {
       if (saveImage == imgName) return;
       doc.images[imgName].src = eval(img + ".src");
   }
}