var timeout    = 500;
            var closetimer = 0;
            var ddmenuitem = 0;

            function h_menu_open()
            {  h_menu_canceltimer();
            h_menu_close();
            ddmenuitem = $(this).find('ul').css('visibility', 'visible');}

            function h_menu_close()
            {  if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}

            function h_menu_timer()
            {  closetimer = window.setTimeout(h_menu_close, timeout);}

            function h_menu_canceltimer()
            {  if(closetimer)
            {  window.clearTimeout(closetimer);
            closetimer = null;}}

            $(document).ready(function()
            {  $('#h_menu > li').bind('mouseover', h_menu_open)
            $('#h_menu > li').bind('mouseout',  h_menu_timer)});

            document.onclick = h_menu_close;