$(document).ready(function () {
    var timeout;
    var coord;

    $("ul.mmm li.first a")
        .mouseover(function () {
            if (timeout) {
                clearTimeout(timeout);
            }
            coord = { left: $(this).offset().left };
            $("div#my_submenu")
                .css("left", coord.left)
                .show();
        })
        .mouseout(function () {
            timeout = setTimeout("hideMe()", 100);
        })

    $("div#my_submenu")
        .mouseover(function () {
            if (timeout) {
                clearTimeout(timeout);
            }
        })
        .mouseout(function () {
            timeout = setTimeout("hideMe()", 100);
        })
});

function hideMe() {
    $("div#my_submenu").hide();
}