var imageUrls = ["/static/images/nav_on/01.png","/static/images/nav_on/02.png","/static/images/nav_on/03.png",
	 "/static/images/nav_on/04.png","/static/images/nav_on/05.png","/static/images/nav_on/06.png",
	 "/static/images/nav_on/07.png","/static/images/nav_on/08.png"];
     var images = [];
     for(var i=0;i<imageUrls.length;i++){
          var image = new Image();
          image.src = imageUrls[i];
          images.push(image);
    }