preload_image('d_home','img/home-over.gif', 'img/home.gif');
preload_image('d_services','img/services-over.gif', 'img/services.gif');
preload_image('d_quote','img/quote-over.gif', 'img/quote.gif');
preload_image('d_upload','img/upload-over.gif', 'img/upload.gif');
preload_image('d_contact','img/contact-over.gif', 'img/contact.gif');