/*
	 Initialize and render the MenuBar when its elements are ready 
	 to be scripted.
    */
    YAHOO.util.Event.onDOMReady(function () {
	var ua = YAHOO.env.ua, oAnim;  // Animation instance

	/*
	     "beforeshow" event handler for each submenu of the MenuBar
	     instance, used to setup certain style properties before
	     the menu is animated.
	*/
	function onSubmenuBeforeShow(p_sType, p_sArgs) {
	    var oBody,
		oElement,
		oShadow,
		oUL;

	    if (this.parent) {
		oElement = this.element;

		/*
		     Get a reference to the Menu's shadow element and 
		     set its "height" property to "0px" to syncronize 
		     it with the height of the Menu instance.
		*/
		oShadow = oElement.lastChild;
		oShadow.style.height = "0px";


		/*
		    Stop the Animation instance if it is currently 
		    animating a Menu.
		*/ 
		if (oAnim && oAnim.isAnimated()) {
		    oAnim.stop();
		    oAnim = null;

		}


		/*
		    Set the body element's "overflow" property to 
		    "hidden" to clip the display of its negatively 
		    positioned <ul> element.
		*/ 
		oBody = this.body;


		//  Check if the menu is a submenu of a submenu.
		if (this.parent && 
		    !(this.parent instanceof YAHOO.widget.MenuBarItem)) {


		    /*
			There is a bug in gecko-based browsers and Opera where 
			an element whose "position" property is set to 
			"absolute" and "overflow" property is set to 
			"hidden" will not render at the correct width when
			its offsetParent's "position" property is also 
			set to "absolute."  It is possible to work around 
			this bug by specifying a value for the width 
			property in addition to overflow.
		    */
		    if (ua.gecko || ua.opera) {
			oBody.style.width = oBody.clientWidth + "px";
		    }


		    /*
			Set a width on the submenu to prevent its 
			width from growing when the animation 
			is complete.
		    */
		    if (ua.ie == 7) {

			oElement.style.width = oElement.clientWidth + "px";

		    }

		}

		oBody.style.overflow = "hidden";

		/*
		    Set the <ul> element's "marginTop" property 
		    to a negative value so that the Menu's height
		    collapses.
		*/ 
		oUL = oBody.getElementsByTagName("ul")[0];
		oUL.style.marginTop = ("-" + oUL.offsetHeight + "px");
	    }
	}


	/*
	    "tween" event handler for the Anim instance, used to 
	    syncronize the size and position of the Menu instance's 
	    shadow and iframe shim (if it exists) with its 
	    changing height.
	*/

	function onTween(p_sType, p_aArgs, p_oShadow) {
	    if (this.cfg.getProperty("iframe")) {
		this.syncIframe();
	    }

	    if (p_oShadow) {
		p_oShadow.style.height = this.element.offsetHeight + "px";
	    }
	}


	/*
	    "complete" event handler for the Anim instance, used to 
	    remove style properties that were animated so that the 
	    Menu instance can be displayed at its final height.
	*/

	function onAnimationComplete(p_sType, p_aArgs, p_oShadow) {
	    var oBody = this.body,
		oUL = oBody.getElementsByTagName("ul")[0];

	    if (p_oShadow) {
		p_oShadow.style.height = this.element.offsetHeight + "px";
	    }

	    oUL.style.marginTop = "";
	    oBody.style.overflow = "";

	    //  Check if the menu is a submenu of a submenu.

	    if (this.parent && 
		!(this.parent instanceof YAHOO.widget.MenuBarItem)) {

		// Clear widths set by the "beforeshow" event handler
		if (ua.gecko || ua.opera) {
		    oBody.style.width = "";
		}

		if (ua.ie == 7) {
		    this.element.style.width = "";
		}
	    }
	}

	/*
	     "show" event handler for each submenu of the MenuBar 
	     instance - used to kick off the animation of the 
	     <ul> element.
	*/
	function onSubmenuShow(p_sType, p_sArgs) {
	    var oElement,
		oShadow,
		oUL;

	    if (this.parent) {
		oElement = this.element;
		oShadow = oElement.lastChild;
		oUL = this.body.getElementsByTagName("ul")[0];

		/*
		     Animate the <ul> element's "marginTop" style 
		     property to a value of 0.
		*/
		oAnim = new YAHOO.util.Anim(oUL, 
		    { marginTop: { to: 0 } }, 0.1);
		    //.5, YAHOO.util.Easing.easeOut);


		oAnim.onStart.subscribe(function () {
		    oShadow.style.height = "100%";
		});


		oAnim.animate();

		/*
		    Subscribe to the Anim instance's "tween" event for 
		    IE to syncronize the size and position of a 
		    submenu's shadow and iframe shim (if it exists)  
		    with its changing height.
		*/
		if (YAHOO.env.ua.ie) {
		    oShadow.style.height = oElement.offsetHeight + "px";
		    /*
			Subscribe to the Anim instance's "tween"
			event, passing a reference Menu's shadow 
			element and making the scope of the event 
			listener the Menu instance.
		    */
		    oAnim.onTween.subscribe(onTween, oShadow, this);
		}


		/*
		    Subscribe to the Anim instance's "complete" event,
		    passing a reference Menu's shadow element and making 
		    the scope of the event listener the Menu instance.
		*/
		oAnim.onComplete.subscribe(onAnimationComplete, oShadow, this);
	    }
	}

	/*
	     Instantiate a MenuBar:  The first argument passed to the 
	     constructor is the id of the element in the page 
	     representing the MenuBar; the second is an object literal 
	     of configuration properties.
	*/
	var oMenuBar = new YAHOO.widget.MenuBar("categories", { 
						    autosubmenudisplay: true, 
						    hidedelay: 750, 
						    lazyload: true });

	/*
	     Subscribe to the "beforeShow" and "show" events for 
	     each submenu of the MenuBar instance.
	*/
	oMenuBar.subscribe("beforeShow", onSubmenuBeforeShow);
	oMenuBar.subscribe("show", onSubmenuShow);

	/*
	     Call the "render" method with no arguments since the 
	     markup for this MenuBar already exists in the page.
	*/
	oMenuBar.render();          
    });