if (document.images) {
  
  imageGon = new Image();
  imageGon.src = "../images/safesON.gif";
  
  imageGoff = new Image();
  imageGoff.src = "../images/safes.gif";
    
  imageHon = new Image();
  imageHon.src = "../images/keysON.gif";
  
  imageHoff = new Image();
  imageHoff.src = "../images/keys.gif";
    
  imageIon = new Image();
  imageIon.src = "../images/hardwareON.gif";
  
  imageIoff = new Image();
  imageIoff.src = "../images/hardware.gif";
    
  imageJon = new Image();
  imageJon.src = "../images/residentialON.gif";
  
  imageJoff = new Image();
  imageJoff.src = "../images/residential.gif";
    
  imageKon = new Image();
  imageKon.src = "../images/commercialON.gif";
  
  imageKoff = new Image();
  imageKoff.src = "../images/commercial.gif";
    
  imageLon = new Image();
  imageLon.src = "../images/servicesON.gif";
  
  imageLoff = new Image();
  imageLoff.src = "../images/services.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");
    }
  }
}