img = new Object();
   img.foverview = new Image();
   img.foverview_ = new Image();
   img.dan = new Image();
   img.dan_ = new Image();
   img.roger = new Image();
   img.roger_ = new Image();
   img.contact = new Image();
   img.contact_ = new Image();
   img.foverview.src = "images/b_foverview.gif";
   img.foverview_.src = "images/b_foverview_.gif";
   img.dan.src = "images/b_dan.gif";
   img.dan_.src = "images/b_dan_.gif";
   img.roger.src = "images/b_roger.gif";
   img.roger_.src = "images/b_roger_.gif";
   img.contact.src = "images/b_contact.gif";
   img.contact_.src = "images/b_contact_.gif";

   function changeImage(id,action) {
    eval("document.images['" + id + "'].src=img." + id + action + ".src;");
   }