<script type="text/javascript">
            var $jQuery = jQuery.noConflict();
            $jQuery(document).ready(function () {

                $jQuery('#menu-mymenu li').hover(
                function () {
                    //show its submenu
                    $jQuery('ul', this).slideDown(100);

                },
                function () {
                    //hide its submenu
                    $jQuery('ul', this).slideUp(100);
                }
            );

            });
        </script>