flack / openpsa

      var $button = this.$button;

      // hide the menu, maybe with a speed/effect combo

      if (!!effect) {

         if (typeof effect == 'string') {

            $menu.hide(effect, this.speed);

         }

         else if (typeof effect == 'object' && effect.constructor == Array) {

            $menu.hide(effect[0], effect[1] || this.speed);

         }

         else if (typeof effect == 'object' && effect.constructor == Object) {

            $menu.hide(effect);

         }

      }

      else {

         $menu.css('display','none');

      }

      $button.removeClass('ui-state-active').trigger('blur').trigger('mouseleave');

      this.element.trigger('blur');    // For jQuery Validate

      this.position();

      // Do any specified open animation effect after positioning the menu.

      if (!!effect) {

         // Menu must be hidden for some effects (e.g. fade) to work.

         $menu.css('display','none');

         if (typeof effect == 'string') {

            $menu.show(effect, this.speed);

         }

         else if (typeof effect == 'object' && effect.constructor == Array) {

            $menu.show(effect[0], effect[1] || this.speed);

         }

         else if (typeof effect == 'object' && effect.constructor == Object) {

            $menu.show(effect);

         }

      }

      // focus the first not disabled option or filter input if available

      var filter = $header.find(".ui-multiselect-filter");