$(document).ready(function () {
    $("#menu a").click(fOption);
});

function fOption() {
    var jThis = $(this);
    var href  = jThis.attr("href");
    if(href.indexOf("#")>-1) {
        $(".submenu").css({ display: "none" });
        jThis.parent().children("ul").css({ display: "block" });
        jThis.parents(".submenu").css({ display: "block" });
        return false;
    }
    return true;
}