// JavaScript Document
function init() {
    if (document.images)
    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
	  image_url[0] = "images/menu-bg-0.jpg";
      image_url[1] = "images/menu-bg-1.jpg";
      image_url[2] = "images/menu-bg-2.jpg";
      image_url[3] = "images/menu-bg-3.jpg";
	  image_url[4] = "images/menu-bg-4.jpg";
	  image_url[5] = "images/menu-bg-5.jpg";
	  image_url[6] = "images/menu-bg-6.jpg";

       for(var i=0; i<=7; i++) 
         preload_image_object.src = image_url[i];
    }
}

function swap(num) {	
	e = document.getElementById("menucontainer");
	newImage = "images/menu-bg-"+num+".jpg";
	e.style.backgroundImage = "url("+newImage+")";	
}