//preload images
var pics = new Array();
var img = new Array("menu_top1.png", "menu_top1_active.png", "menu_top2.png",
		"menu_top2_active.png", "menu_top3.png", "menu_top3_active.png",
		"menu_top4.png", "menu_top4_active.png", "menu_top5.png",
		"menu_top5_active.png");
for (i = 0; i < img.length; i++) {
	pics[i] = new Image();
	pics[i].src = "img/" + img[i];
}
var img2 = new Array("menu_bottom_big_back.png",
		"menu_bottom_big_back_active.png", "menu_bottom_small_back.png",
		"menu_bottom_small_back_active.png");
for (i = 0; i < img2.length; i++) {
	pics[i] = new Image();
	pics[i].src = "img/" + img2[i];
}