function fix_loading_size() {
    obj_loading = document.getElementById('ajax_loading');

    height = (typeof window.height != 'undefined')
      ? window.height + window.pageYOffset
      : ((document.compatMode && (document.compatMode != 'BackCompat'))
        ? document.documentElement.scrollHeight
        : document.body.scrollHeight);

    obj_loading.style.height = height + "px";
    obj_loading.style.width = "100%";
}

window.onload = fix_loading_size;