image1 = new Image();
image1.src = "layout/menu-about_us-over.gif";

image2 = new Image();
image2.src = "layout/menu-services-over.gif";

image3 = new Image();
image3.src = "layout/menu-clients-over.gif";

image4 = new Image();
image4.src = "layout/menu-clients-over.gif";