//preload images
var btnBadge = new Image();			btnBadge.src = 'images/btn-badge-cases.jpg';
var btnAcc = new Image();			btnAcc.src = 'images/btn-accessories.jpg';
var btnApparel = new Image();		btnApparel.src = 'images/btn-apparel.jpg';
var btnK9 = new Image();			btnK9.src = 'images/btn-k9.jpg';
var btnHistory = new Image();		btnHistory.src = 'images/btn-history.jpg';
var btnContact = new Image();		btnContact.src = 'images/btn-contact.jpg';
var btnBadgeOn = new Image();		btnBadgeOn.src = 'images/btn-badge-cases-on.jpg';
var btnAccOn = new Image();			btnAccOn.src = 'images/btn-accessories-on.jpg';
var btnApparelOn = new Image();		btnApparelOn.src = 'images/btn-apparel-on.jpg';
var btnK9On = new Image();			btnK9On.src = 'images/btn-k9-on.jpg';
var btnHistoryOn = new Image();		btnHistoryOn.src = 'images/btn-history-on.jpg';
var btnContactOn = new Image();		btnContactOn.src = 'images/btn-contact-on.jpg';
var addToOrder = new Image();		addToOrder.src = 'images/add-to-order.jpg';
var addToOrderOn = new Image();		addToOrderOn.src = 'images/add-to-order-on.jpg';
var orderForm = new Image();		orderForm.src = 'images/order-form.jpg';
var orderFormOn = new Image();		orderFormOn.src = 'images/order-form-on.jpg';

function menuBtnOn(x){
    var newImg = 'images/' + x.substring(0, x.length) + '-on.jpg';
    $(x).src = newImg;
}
function menuBtnOff(x){
    newImg = 'images/' + x + '.jpg';
    $(x).src = newImg;
}