/*
 * Menu item clicked
 */
function load_menu(event) {
    event.stop();
    var a = Event.element(event);
    var menu_item = event.element();

    while ( menu_item.id == '' ) {
        menu_item = menu_item.parentNode;
    }
    var page = menu_item.id.split('_')[1];
    new Ajax.Updater('sidebar_content', page  + '.inc.php', { method: 'get', });
}

/*
 * Init. menu clicked events
 */
function init_menu(event)
{
    $$("#menu li").each( function(menu_item) {
        Event.observe(menu_item, 'click', load_menu, true);
    });
}

Event.observe(window, "load", init_menu);