if (document.images)
    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
      image_url[0] = "../images/bags/icon_baby_carriage.gif";
      image_url[1] = "../images/bags/icon_bicycle.gif";
      image_url[2] = "../images/bags/icon_garment_bag.gif";
      image_url[3] = "../images/bags/icon_large_bag.gif";
      image_url[4] = "../images/bags/icon_large_golf_bag.gif";
      image_url[5] = "../images/bags/icon_medium_bag.gif";
      image_url[6] = "../images/bags/icon_medium_bag_1.gif";
      image_url[7] = "../images/bags/icon_small_bag.gif";
      image_url[8] = "../images/bags/icon_small_bag_1.gif";
      image_url[9] = "../images/bags/icon_std_golf_bag.gif";
      image_url[10] = "../images/bags/icon_surfboard.gif";

       var i = 0;
       for(i=0; i<=3; i++) preload_image_object.src = image_url[i];
    }
	
	function swap_bag_image(id) {
		document.getElementById('bag_image').src = image_url[id];
	}
	function clear_bag_image() {
		document.getElementById('bag_image').src = '';
	}