if (document.images) {
  aboutuson = new Image();
  aboutuson.src = "images/menu/nav_aboutus_on.gif";
  aboutusoff = new Image();
  aboutusoff.src = "images/menu/nav_aboutus_off.gif";
  
  capabilitieson = new Image();
  capabilitieson.src = "images/menu/nav_capabilities_on.gif";
  capabilitiesoff = new Image();
  capabilitiesoff.src = "images/menu/nav_capabilities_off.gif";
  
  employmenton = new Image();
  employmenton.src = "images/menu/nav_employment_on.gif";
  employmentoff = new Image();
  employmentoff.src = "images/menu/nav_employment_off.gif";
  
  qualityon = new Image();
  qualityon.src = "images/menu/nav_quality_on.gif";
  qualityoff = new Image();
  qualityoff.src = "images/menu/nav_quality_off.gif";
  
  newson = new Image();
  newson.src = "images/menu/nav_news_on.gif";
  newsoff = new Image();
  newsoff.src = "images/menu/nav_news_off.gif";
  
  equipmenton = new Image();
  equipmenton.src = "images/menu/nav_equipment_on.gif";
  equipmentoff = new Image();
  equipmentoff.src = "images/menu/nav_equipment_off.gif";

  contacton = new Image();
  contacton.src = "images/menu/nav_contact_on.gif";
  contactoff = new Image();
  contactoff.src = "images/menu/nav_contact_off.gif";
  
  linkson = new Image();
  linkson.src = "images/menu/nav_links_on.gif";
  linksoff = new Image();
  linksoff.src = "images/menu/nav_links_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");
    }
  }
}

function MM_preloadImages() {
      if (document.images) {
      var imgFiles = MM_preloadImages.arguments;
      var preloadArray = new Array();
      for (var i=0; i<imgFiles.length; i++) {
         preloadArray[i] = new Image;
         preloadArray[i].src = imgFiles[i];
      }
   }
}