// cache images
high_image = new Array(9);
for (i = 0; i < high_image.length; i++)
    high_image[i] = new Image();
high_image[0].src = "images/graphics_menu/nav02b_home.jpg";
high_image[1].src = "images/graphics_menu/nav03b_rooms.jpg";
high_image[2].src = "images/graphics_menu/nav04b_policies.jpg";
high_image[3].src = "images/graphics_menu/nav05b_amenities.jpg";
high_image[4].src = "images/graphics_menu/nav06b_panoramas.jpg";
high_image[5].src = "images/graphics_menu/nav07b_reviews.jpg";
high_image[6].src = "images/graphics_menu/nav08b_location.jpg";
high_image[7].src = "images/graphics_menu/nav09b_attractions.jpg";
high_image[8].src = "images/graphics_menu/nav10b_Contact.jpg";

low_image = new Array(9);
for (i = 0; i < low_image.length; i++)
    low_image[i] = new Image();
low_image[0].src = "images/graphics_menu/nav02a_home.jpg";
low_image[1].src = "images/graphics_menu/nav03a_rooms.jpg";
low_image[2].src = "images/graphics_menu/nav04a_policies.jpg";
low_image[3].src = "images/graphics_menu/nav05a_amenities.jpg";
low_image[4].src = "images/graphics_menu/nav06a_panoramas.jpg";
low_image[5].src = "images/graphics_menu/nav07a_reviews.jpg";
low_image[6].src = "images/graphics_menu/nav08a_location.jpg";
low_image[7].src = "images/graphics_menu/nav09a_attractions.jpg";
low_image[8].src = "images/graphics_menu/nav10a_Contact.jpg";

// change to highlight image
function change_high(num) {
    document.images[num+1].src = high_image[num].src;
}

// change to normal image
function change_low(num) {
    document.images[num+1].src = low_image[num].src;
}