var __mouseover_images = new Array();
var __mouseout_images  = new Array();

function mouse_over (image_container_id) {
    var image = document.getElementById(image_container_id);

    if (typeof(image) != "undefined" && typeof(__mouseout_images) != "undefined" && typeof(__mouseover_images) != "undefined") {
        __mouseout_images[image_container_id] = image.src;
        image.src = __mouseover_images[image_container_id].src;
    }
}

function mouse_out (image_container_id) {
    var image = document.getElementById(image_container_id);
    if (typeof(image) != "undefined" && typeof(__mouseout_images) != "undefined") {
        image.src = __mouseout_images[image_container_id];
    }
}