var img1 = new Image();
var img2 = new Image();
var img3 = new Image();
var img4 = new Image();
var img5 = new Image();
img1.src = "menu/enable_b1_over.gif";
img2.src = "menu/enable_b2_over.gif";
img3.src = "menu/enable_b3_over.gif";
img4.src = "menu/enable_b4_over.gif";
img5.src = "menu/enable_b5_over.gif";