function dropMenu(obj) {
    $(obj).each(function () {
        var theSpan = $(this);
        var theMenu = theSpan.find(".submenu");
        var tarHeight = theMenu.height();
        theMenu.css({ height: 0, opacity: 0 });
        var t1;
        function expand() {
            clearTimeout(t1);
            theMenu.stop().show().animate({ height: tarHeight, opacity: 0.7 }, 200);
        }
        function collapse() {
            clearTimeout(t1);
            t1 = setTimeout(function () {
                theMenu.stop().animate({ height: 0, opacity: 0 }, 200, function () {
                    $(this).css({ display: "none" });
                });
            }, 250);
        }
        theSpan.hover(expand, collapse);
        theMenu.hover(expand, collapse);
    });
}
$(document).ready(function () {
    dropMenu(".drop_menu");
});