if (document.images) {
  img1on = new Image();
  img1on.src =  '/images/topnav_view_on.gif';    
  img2on = new Image();
  img2on.src =  '/images/topnav_checkout_on.gif'; 
  img3on = new Image();
  img3on.src =  '/images/topnav_contact_on.gif';
  img4on = new Image();
  img4on.src =  '/images/topnav_home_on.gif';
  img5on = new Image();
  img5on.src =  '/images/topnav_about_on.gif';
  img6on = new Image();
  img6on.src =  '/images/topnav_customer_on.gif';
  img7on = new Image();
  img7on.src =  '/images/topnav_videos_on.gif';
  img8on = new Image();
  img8on.src =  '/images/topnav_team_on.gif';
  img9on = new Image();
  img9on.src =  '/images/topnav_dealer_on.gif';
  img10on = new Image();
  img10on.src =  '/images/leftnav_eyewear_on.gif';
  img11on = new Image();
  img11on.src =  '/images/leftnav_featured_on.gif';
  img12on = new Image();
  img12on.src =  '/images/leftnav_tech_on.gif';
  
  img1off = new Image();
  img1off.src = '/images/topnav_view_off.gif';
  img2off = new Image();
  img2off.src = '/images/topnav_checkout_off.gif';
  img3off = new Image();
  img3off.src = '/images/topnav_contact_off.gif';
  img4off = new Image();
  img4off.src = '/images/topnav_home_off.gif';
  img5off = new Image();
  img5off.src = '/images/topnav_about_off.gif';
  img6off = new Image();
  img6off.src = '/images/topnav_customer_off.gif';
  img7off = new Image();
  img7off.src = '/images/topnav_videos_off.gif';
  img8off = new Image();
  img8off.src = '/images/topnav_team_off.gif';
  img9off = new Image();
  img9off.src = '/images/topnav_dealer_off.gif';
  img10off = new Image();
  img10off.src = '/images/leftnav_eyewear_off.gif';
  img11off = new Image();
  img11off.src = '/images/leftnav_featured_off.gif';
  img12off = new Image();
  img12off.src = '/images/leftnav_tech_off.gif';
}

function imgOn(imgName) {
  if (document.images) {
    document[imgName].src = eval(imgName + "on.src");
} 
}

function imgOff(imgName) {
  if (document.images) {
    document[imgName].src = eval(imgName + "off.src");
}
}