<!--
//  ua=navigator.userAgent;
//  v=navigator.appVersion.substring(0,1);
//  if ((ua.lastIndexOf("MSIE")!=-1) && (v!='1') && (v!='2') && (v!='3'))

   if (document.images){

      button1     = new Image ();
      button1.src = "images/nav_universiteit.gif";

      button2     = new Image ();
      button2.src = "images/nav_universiteit_on.gif";

      button3     = new Image ();
      button3.src = "images/nav_hbos.gif";

      button4     = new Image ();
      button4.src = "images/nav_hbos_on.gif";

      button5     = new Image ();
      button5.src = "images/nav_steden.gif";

      button6     = new Image ();
      button6.src = "images/nav_steden_on.gif";

      button7     = new Image ();
      button7.src = "images/nav_cursussen.gif";

      button8     = new Image ();
      button8.src = "images/nav_cursussen_on.gif";
     
     }

   // this function swaps the images

function swapImage(oldButton,newButton){
   if (document.images)
      document.images[oldButton].src=eval(newButton + ".src");
}