cara menambahkan onhover scrolling untuk menu dropdown tanpa scroll bar

Saya memiliki daftar dropdown yang sangat panjang ,,,, saya menginginkannya dengan onhover scrolling, tetapi tanpa scroll bar tolong bantu saya perubahan apa yang harus saya lakukan ......

ubah topmenu.phtml tambahkan ini. itu bekerja dengan dua level.

<nav id="nav">
        <ol class="dropdown">
            <?php echo $_menu ?>
        </ol>
    </nav>

tambahkan di bawah footer.phtmldan lihat output dan juga gaya yang Anda inginkan saya membuat perubahan dalam gaya.

 <script>
    var maxHeight = 300;
    var maxwidth 
    jQuery.noConflict();
    jQuery(function(){

        jQuery(".dropdown > li").hover(function() { 

             var jQuerycontainer = jQuery(this),
                 jQuerylist = jQuerycontainer.find("ul"),
                 jQueryanchor = jQuerycontainer.find("a"),
                 height = jQuerylist.height() * 1.1,       // make sure there is enough room at the bottom
                 multiplier = height / maxHeight;     // needs to move faster if list is taller

            // need to save height here so it can revert on mouseout            
            jQuerycontainer.data("origHeight", jQuerycontainer.height());

            // so it can retain it's rollover color all the while the dropdown is open
            jQueryanchor.addClass("hover");

            // make sure dropdown appears directly below parent list item    
            jQuerylist
                .show()
                .css({

                    paddingTop: jQuerycontainer.data("origHeight")
                });

            // don't do any animation if list shorter than max
            if (multiplier > 1) {
                jQuerycontainer
                    .css({
                        height: maxHeight,
                        overflow: "hidden",


                    })
                    .mousemove(function(e) {
                        var offset = jQuerycontainer.offset();
                        var relativeY = ((e.pageY - offset.top) * multiplier) - (jQuerycontainer.data("origHeight") * multiplier);
                        if (relativeY > jQuerycontainer.data("origHeight")) {
                            jQuerylist.css("top", -relativeY +jQuerycontainer.data("origHeight"));
                        };
                    });
            }

        }, function() {

            var jQueryel = jQuery(this);

            // put things back to normal
            jQueryel
                .height(jQuery(this).data("origHeight"))
                .find("ul")
                .css({  })
                .hide()
                .end()
                .find("a")
                .removeClass("hover");

        })});

        //Add down arrow only to menu items with submenus
        // jQuery(".nav-primary > li:has('ul')").each(function() {
        //     jQuery(this).find("a:first").append("<img src='images/down-arrow.png' />");
        // });
    </script>
    <style type="text/css">
        ol.dropdown {
        position: relative;
        width: 100%;
    }
    ol.dropdown li {
        background: none repeat scroll 0 0 #ccc;
        float: left;
        font-weight: bold;
        position: relative;
        width: 180px;
    }
    ol.dropdown a:hover {
        color: #000;
    }
    ol.dropdown li a {
        color: #222;
        display: block;
        padding: 20px 8px;
        position: relative;
        z-index: 2000;
    }
    ol.dropdown li a:hover, ol.dropdown li a.hover {
        background: none repeat scroll 0 0 #f3d673;
        position: relative;
    }
    ol.dropdown ul {
        display: none;
        left: 0;
        position: absolute;
        top: 0;
        width: 180px;
        z-index: 1000;
    }
    ol.dropdown ul li {
        background: none repeat scroll 0 0 #f6f6f6;
        border-bottom: 1px solid #ccc;
        color: #000;
        font-weight: normal;
    }
    ol.dropdown ul li a {
        background: none repeat scroll 0 0 #eee !important;
        display: block;
    }
    ol.dropdown ul li a:hover {
        background: none repeat scroll 0 0 #f3d673 !important;
        display: block;
    }

    </style>