if (document.images) {
     button00a = new Image
     button00b = new Image
     button01a = new Image
     button01b = new Image
     button02a = new Image
     button02b = new Image
     button03a = new Image
     button03b = new Image
     button04a = new Image
     button04b = new Image
     button05a = new Image
     button05b = new Image
     button06a = new Image
     button06b = new Image

     button00a.src = 'images/menu/menu-11.jpg'
     button00b.src = 'images/menu/menu-1.jpg'
     button01a.src = 'images/menu/menu-22.jpg'
     button01b.src = 'images/menu/menu-2.jpg'
     button02a.src = 'images/menu/menu-33.jpg'
     button02b.src = 'images/menu/menu-3.jpg'
     button03a.src = 'images/menu/menu-44.jpg'
     button03b.src = 'images/menu/menu-4.jpg'
     button04a.src = 'images/menu/menu-55.jpg'
     button04b.src = 'images/menu/menu-5.jpg'
     button05a.src = 'images/menu/menu-66.jpg'
     button05b.src = 'images/menu/menu-6.jpg'
 }