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

            function jsddm_open()
            {  jsddm_canceltimer();
                jsddm_close();
                ddmenuitem = $(this).find('ul').css('visibility', 'visible');
                if($(this).find('ul').length > 0){
                    if ($(this).parent().hasClass('m1')) $('.m2').addClass('m2hovered');
                }   
            }

            function jsddm_close()
            {  if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');
                $('.m2').removeClass('m2hovered');
            }

            function jsddm_timer()
            {  closetimer = window.setTimeout(jsddm_close, timeout);}

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

            $(document).ready(function()
            {  $('.main-menu > li').bind('mouseover', jsddm_open)
                $('.main-menu > li').bind('mouseout',  jsddm_timer)
            });

            document.onclick = jsddm_close;