function preLM(){
        var menu;
        menu = new Image(); menu.src = "images/shop_map1.gif";
        menu = new Image(); menu.src = "images/shop_map2.gif";
        menu = new Image(); menu.src = "images/shop_map3.gif";
        menu = new Image(); menu.src = "images/shop_map4.gif";
        menu = new Image(); menu.src = "images/shop_map5.gif";
        menu = new Image(); menu.src = "images/shop_map6.gif";
}
function mapon(n){
        document.images["map"].src = "images/shop_map" + n + ".gif";
}
function mapoff(){
        document.images["map"].src =  "images/shop_map0.gif";
}