YAHOO.util.Event.onContentReady("mainnavbar", function () {
    var ua = YAHOO.env.ua,
        oAnim;  // Animation instance
    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";                        
            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 = "";
            }                    
        }                    
    }
    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}}, .5, YAHOO.util.Easing.easeOut);
            oAnim.onStart.subscribe(function () {        
                oShadow.style.height = "100%";                     
            });
            oAnim.animate();
			    
            if (YAHOO.env.ua.ie) {                            
                oShadow.style.height = oElement.offsetHeight + "px";
                oAnim.onTween.subscribe(onTween, oShadow, this);    
            }
            oAnim.onComplete.subscribe(onAnimationComplete, oShadow, this);                    
        }                
    }
    var oMenuBar = new YAHOO.widget.MenuBar("mainnavbar", { 
                                                autosubmenudisplay: true, 
                                                hidedelay: 750, 
                                                lazyload: true });
    if (ua.ie != 6) {
		oMenuBar.subscribe("beforeShow", onSubmenuBeforeShow);
		oMenuBar.subscribe("show", onSubmenuShow);
	}
    oMenuBar.render();            
});