<!--
//  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/stappenplan_rood.jpg";

      button2     = new Image ();
      button2.src = "images/stappenplan_zwart.jpg";

      }

   // this function swaps the images

function swapImage(oldButton,newButton){
   if (document.images)
      document.images[oldButton].src=eval(newButton + ".src");
}  
//-->