if (document.images)
{
   home               = new Image();
   home.src           = "images/home.gif";
   homedown           = new Image();
   homedown.src       = "images/home_over.gif";

   about                 = new Image();
   about.src             = "images/about.gif";
   aboutdown             = new Image();
   aboutdown.src         = "images/about_over.gif";

   sponsors              = new Image();
   sponsors.src          = "images/sponsors.gif";
   sponsorsdown          = new Image();
   sponsorsdown.src      = "images/sponsors_over.gif";

   vendors                  = new Image();
   vendors.src              = "images/vendors.gif";
   vendorsdown              = new Image();
   vendorsdown.src          = "images/vendors_over.gif";
   
   contact              = new Image();
   contact.src           = "images/contact.gif";
   contactdown           = new Image();
   contactdown.src       = "images/contact_over.gif";

}

function buttondown(bname)
{
    if (document.images)
        document[bname].src = eval(bname + "down.src");
}

function buttonup(bname)
{
    if (document.images)
        document[bname].src = eval(bname + ".src");
}