if (document.images) {
  
  
  	// each of the following blocks of code corresponds to an image within the 
  	// navigation of the site
  	
  	
  	// main navigation
  	necklaces = new Image();
  	necklaces.src = "/images/nav/necklaces.gif";
 	necklaces_on = new Image();
  	necklaces_on.src = "/images/nav/necklaces_on.gif";
  	
  	
  	bracelets = new Image();
  	bracelets.src = "/images/nav/bracelets.gif";
 	bracelets_on = new Image();
  	bracelets_on.src = "/images/nav/bracelets_on.gif";
  
  
  	rings = new Image();
  	rings.src = "/images/nav/rings.gif";
 	rings_on = new Image();
  	rings_on.src = "/images/nav/rings_on.gif";
  	
  	
  	earrings = new Image();
  	earrings.src = "/images/nav/earrings.gif";
 	earrings_on = new Image();
  	earrings_on.src = "/images/nav/earrings_on.gif";
  
  
  	pendants = new Image();
  	pendants.src = "/images/nav/pendants.gif";
 	pendants_on = new Image();
  	pendants_on.src = "/images/nav/pendants_on.gif";
  	
  	
  	brooches = new Image();
  	brooches.src = "/images/nav/brooches.gif";
 	brooches_on = new Image();
  	brooches_on.src = "/images/nav/brooches_on.gif";
  	
  	
  	carvings = new Image();
  	carvings.src = "/images/nav/carvings.gif";
 	carvings_on = new Image();
  	carvings_on.src = "/images/nav/carvings_on.gif";
  	
  	
  	tiger_cat = new Image();
  	tiger_cat.src = "/images/nav/tiger_cat.gif";
 	tiger_cat_on = new Image();
  	tiger_cat_on.src = "/images/nav/tiger_cat_on.gif";

  	
  	photos = new Image();
  	photos.src = "/images/nav/photos.gif";
 	photos_on = new Image();
  	photos_on.src = "/images/nav/photos_on.gif";
  	
  
  	// sub navigation
  	ordering_info = new Image();
  	ordering_info.src = "/images/subnav/ordering_info.gif";
 	ordering_info_on = new Image();
  	ordering_info_on.src = "/images/subnav/ordering_info_on.gif";
  	
  	
  	contact = new Image();
  	contact.src = "/images/subnav/contact.gif";
 	contact_on = new Image();
  	contact_on.src = "/images/subnav/contact_on.gif";
  	
  	
  	about = new Image();
  	about.src = "/images/subnav/about.gif";
 	about_on = new Image();
  	about_on.src = "/images/subnav/about_on.gif";
  	
  	
  	testimonials = new Image();
  	testimonials.src = "/images/subnav/testimonials.gif";
 	testimonials_on = new Image();
  	testimonials_on.src = "/images/subnav/testimonials_on.gif";
  	
  	
  	big_cat = new Image();
  	big_cat.src = "/images/subnav/big_cat.gif";
 	big_cat_on = new Image();
  	big_cat_on.src = "/images/subnav/big_cat_on.gif";
  
}

function switchOn(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + "_on.src");
    }
}
  
function switchOff(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + ".src");
    }
}