if (document.images)
{
   about                 = new Image();
   about.src             = "images/about.jpg";
   aboutdown             = new Image();
   aboutdown.src         = "images/about_over.jpg";

   transportation              = new Image();
   transportation.src          = "images/transportation.jpg";
   transportationdown          = new Image();
   transportationdown.src      = "images/transportation_over.jpg";

   packaging                  = new Image();
   packaging.src              = "images/packaging.jpg";
   packagingdown              = new Image();
   packagingdown.src          = "images/packaging_over.jpg";
   
   warehouse              = new Image();
   warehouse.src           = "images/warehouse.jpg";
   warehousedown           = new Image();
   warehousedown.src       = "images/warehouse_over.jpg";
   
   gallery                 = new Image();
   gallery.src             = "images/gallery.jpg";
   gallerydown             = new Image();
   gallerydown.src         = "images/gallery_over.jpg";

   rate              = new Image();
   rate.src          = "images/rate.jpg";
   ratedown          = new Image();
   ratedown.src      = "images/rate_over.jpg";

   application                  = new Image();
   application.src              = "images/application.jpg";
   applicationdown              = new Image();
   applicationdown.src          = "images/application_over.jpg";
   
   contact              = new Image();
   contact.src           = "images/contact.jpg";
   contactdown           = new Image();
   contactdown.src       = "images/contact_over.jpg";

}

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");
}