// Load images required for buttons on page
  menuItem1on = new Image();    menuItem1on.src = "images/garage-on.gif";
  menuItem1off = new Image();   menuItem1off.src = "images/garage-off.gif";
  menuItem2on = new Image();    menuItem2on.src = "images/workshop-on.gif";
  menuItem2off = new Image();   menuItem2off.src = "images/workshop-off.gif";
  menuItem3on = new Image();    menuItem3on.src = "images/shed-on.gif";
  menuItem3off = new Image();   menuItem3off.src = "images/shed-off.gif";
  menuItem4on = new Image();    menuItem4on.src = "images/accessory-on.gif";
  menuItem4off = new Image();   menuItem4off.src = "images/accessory-off.gif";
  menuItem5on = new Image();    menuItem5on.src = "images/cq-on.gif";
  menuItem5off = new Image();   menuItem5off.src = "images/cq-off.gif";
  menuItem6on = new Image();    menuItem6on.src = "images/wtb-on.gif";
  menuItem6off = new Image();   menuItem6off.src = "images/wtb-off.gif";
  menuItem7on = new Image();    menuItem7on.src = "images/htb-on.gif";
  menuItem7off = new Image();   menuItem7off.src = "images/htb-off.gif";
  menuItem8on = new Image();    menuItem8on.src = "images/contact-on.gif";
  menuItem8off = new Image();   menuItem8off.src = "images/contact-off.gif";
  menuItem9on = new Image();    menuItem9on.src = "images/home-on.gif";
  menuItem9off = new Image();   menuItem9off.src = "images/home-off.gif";
  menuItem10on = new Image();    menuItem10on.src = "images/leofric-on.gif";
  menuItem10off = new Image();   menuItem10off.src = "images/leofric-off.gif";
  menuItem11on = new Image();    menuItem11on.src = "images/mayfair-on.gif";
  menuItem11off = new Image();   menuItem11off.src = "images/mayfair-off.gif";
  menuItem12on = new Image();    menuItem12on.src = "images/next-on.gif";
  menuItem12off = new Image();   menuItem12off.src = "images/next-off.gif";
  menuItem13on = new Image();    menuItem13on.src = "images/prev-on.gif";
  menuItem13off = new Image();   menuItem13off.src = "images/prev-off.gif";