function OpenMenu(id){ 
			document.getElementById( id ).style.visibility = 'visible';
		}
		function CloseMenu(id){ 
			document.getElementById( id ).style.visibility = 'hidden';
		}
		
if (document.images) {
   img1 = new Image(); img1.src = "img/menu_img_001_b.jpg";
   img2 = new Image(); img2.src = "img/menu_img_002_b.jpg";  
   img3 = new Image(); img3.src = "img/menu_img_003_b.jpg";  
   img4 = new Image(); img4.src = "img/menu_img_004_b.jpg";  
   img5 = new Image(); img5.src = "img/menu_img_005_b.jpg"; 
   img6 = new Image(); img6.src = "img/menu_img_006_b.jpg"; 
  
}
function setImage(img, image) {
   if (img) {
      img.src = image;
   }
}