image1 = new Image();
image1.src = "_siteImg/buttons/btn_home_hover.gif";
image2 = new Image();
image2.src = "_siteImg/buttons/btn_about_hover.gif";
image3 = new Image();
image3.src = "_siteImg/buttons/btn_showcase_hover.gif";
image4 = new Image();
image4.src = "_siteImg/buttons/btn_contact_hover.gif";