/*
     Initialize and render the MenuBar when its elements are ready 
     to be scripted.
*/
YAHOO.util.Event.onContentReady("main_navigation", function () {
    /*
        Instantiate a MenuBar:  The first argument passed to the constructor
        is the id for the Menu element to be created, the second is an 
        object literal of configuration properties.
    */
    var oMenuBar = new YAHOO.widget.MenuBar("main_navigation", { 
                                                autosubmenudisplay: true, 
                                                hidedelay: 750, 
                                                lazyload: true });
    /*
         Call the "render" method with no arguments since the 
         markup for this MenuBar instance is already exists in 
         the page.
    */
    oMenuBar.render();
});