snippet: Jquery Dropdown_menu

gistfile1

    function dropdown_menu() {
    $("#sub-menu-id a, .subnav a");
    $(" #sub-menu-id ").css({
    display: "none",
    opacity: "1"
    }); // fix for opera browser
    $("#sub-menu-id li").each(function() {
    var $subNav = jQuery(this).find('ul:first');
    $(this).hover(function() {
    $subNav.stop().css({
    overflow: "hidden",
    height: "auto",
    display: "none"
    }).slideDown(350, function() {
    $(this).css({
    overflow: "visible",
    height: "auto"
    });
    });
    }, function() {
    $subNav.stop().slideUp(350, function() {
    $(this).css({
    overflow: "hidden",
    display: "none"
    });
    });
    });
    });
    }
     
     
    //USAGE
    <script>
    jQuery(document).ready(function(){ dropdown_menu(); });
    </script>