function shop() {
var shopimg=document.getElementById('shopimg');
shopimg.src='storelight.png';
}

function on(pic) {
var shopimg=document.getElementById('shopimg');
shopimg.src=pic;
var shop=document.getElementById('shop');
shop.style.color='#fff';
shop.style.backgroundImage="url('shopbga.png')";
}
function off(pic) {
var shopimg=document.getElementById('shopimg');
shopimg.src=pic;
var shop=document.getElementById('shop');
shop.style.color='#aaa';
shop.style.backgroundImage="url('shopbgb.png')";
}