if (document.images) {

//ons

  im1on = new Image();
  im1on.src = "images/home_on.gif";

  im2on = new Image();
  im2on.src = "images/contact_on.gif";


  im3on = new Image();
  im3on.src = "images/staff_on.gif";

  im4on = new Image();
  im4on.src = "images/jobs_on.gif";
  
  im5on = new Image();
  im5on.src = "images/message_on.gif";
  
  im6on = new Image();
  im6on.src = "images/locations_on.gif";
  
   im7on = new Image();
  im7on.src = "images/greyTriangleOn.gif";


  
// offs

  im1off = new Image();
  im1off.src = "images/home_off.gif";

  im2off = new Image();
  im2off.src = "images/contact_off.gif";

  im3off = new Image();
  im3off.src = "images/staff_off.gif";

  im4off = new Image();
  im4off.src = "images/jobs_off.gif";
  
  im5off = new Image();
  im5off.src = "images/message_off.gif";
  
  im6off = new Image();
  im6off.src = "images/locations_off.gif";
  
   im7off = new Image();
  im7off.src = "images/greyTriangleOff.gif";

  


}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}