img1 = new Image();
img1.src = "graphics/horizbg_over.gif";
img2 = new Image();
img2.src = "graphics/button_green_over.gif";
img3 = new Image();
img3.src = "graphics/button_blue_over.gif";
img4 = new Image();
img4.src = "graphics/button_orange_over.gif";
img5 = new Image();
img5.src = "graphics/button_brown_over.gif";