function preloadImages() {
img1 = new Image();
img1.src='images/link_home_ro.gif';

img2 = new Image();
img2.src='images/link_buy_ro.gif';

img3 = new Image();
img3.src='images/link_sell_ro.gif';

img4 = new Image();
img4.src='images/link_about_ro.gif';

img5 = new Image();
img5.src='images/link_terms_ro.gif';

img6 = new Image();
img6.src='images/link_contact_ro.gif';
}