// Instantiate and render the menu when it is available in the DOM
  YAHOO.util.Event.onContentReady("sort_by_price_dropdown", function () {
  var oMenu = new YAHOO.widget.Menu("sort_by_price_dropdown", { hidedelay: 750, width: 140 }) ;

    oMenu.showEvent.subscribe(function () {
        this.focus();
    });
    oMenu.render();
    YAHOO.util.Event.addListener("menutoggle", "mouseover", oMenu.show, null, oMenu);    
});