if (document.images) {
  newtruckson = new Image();
  newtruckson.src = "images/menu/bttn_newtrucks_on.gif";
  newtrucksoff = new Image();
  newtrucksoff.src = "images/menu/bttn_newtrucks_off.gif";
  
  usedtruckson = new Image();
  usedtruckson.src = "images/menu/bttn_usedtrucks_on.gif";
  usedtrucksoff = new Image();
  usedtrucksoff.src = "images/menu/bttn_usedtrucks_off.gif";
  
  financingon = new Image();
  financingon.src = "images/menu/bttn_financing_on.gif";
  financingoff = new Image();
  financingoff.src = "images/menu/bttn_financing_off.gif";
  
  partson = new Image();
  partson.src = "images/menu/bttn_parts_on.gif";
  partsoff = new Image();
  partsoff.src = "images/menu/bttn_parts_off.gif";
  
  serviceon = new Image();
  serviceon.src = "images/menu/bttn_service_on.gif";
  serviceoff = new Image();
  serviceoff.src = "images/menu/bttn_service_off.gif";
  
  aboutuson = new Image();
  aboutuson.src = "images/menu/bttn_aboutus_on.gif";
  aboutusoff = new Image();
  aboutusoff.src = "images/menu/bttn_aboutus_off.gif";
  
  contactuson = new Image();
  contactuson.src = "images/menu/bttn_contactus_on.gif";
  contactusoff = new Image();
  contactusoff.src = "images/menu/bttn_contactus_off.gif";
  
  locationson = new Image();
  locationson.src = "images/menu/bttn_locations_on.gif";
  locationsoff = new Image();
  locationsoff.src = "images/menu/bttn_locations_off.gif";
  
  jobson = new Image();
  jobson.src = "images/menu/bttn_jobs_on.gif";
  jobsoff = new Image();
  jobsoff.src = "images/menu/bttn_jobs_off.gif";
  
  particulatetrapson = new Image();
  particulatetrapson.src = "images/menu/bttn_particulatetraps_on.gif";
  particulatetrapsoff = new Image();
  particulatetrapsoff.src = "images/menu/bttn_particulatetraps_off.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");
    }
  }
}