Mega menu slide down on hover with carousel

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<div class="container">
    <nav class="navbar navbar-inverse">
        <div class="navbar-header">
            <button class="navbar-toggle" type="button" data-toggle="collapse" data-target=".js-navbar-collapse">	<span class="sr-only">Toggle navigation</span>
	<span class="icon-bar"></span>
	<span class="icon-bar"></span>
	<span class="icon-bar"></span>

            </button>
        </div>
        <div class="collapse navbar-collapse js-navbar-collapse">
            <ul class="nav navbar-nav">

                <li class="dropdown mega-dropdown">	<a href="#" class="dropdown-toggle" data-toggle="dropdown">About Us <span class="caret"></span></a>	
                    <ul class="dropdown-menu mega-dropdown-menu" id='about_us_dropdown'>
                        <li class="col-sm-12">
                            <ul class='list-inline'>
                                <li><a href="#">Overview</a>
                                </li>
                                <li><a href="#">Vision and Mission</a>
                                </li>
                                <li><a href="#">Boards of Directors</a>
                                </li>
                                <li><a href="#">Our Management Team</a>
                                </li>
                                <li><a href="about_pol/subsidiary.html">Subsidiary</a>
                                </li>
                                <li><a href="about_pol/agoc.html">Attock Group of Companies</a>
                                </li>
                            </ul>
                        </li>
                    </ul>
                </li>



            </ul>
        </div>
        <!-- /.nav-collapse -->
   ...

CSS

@import url(http://fonts.googleapis.com/css?family=Open+Sans:400, 700);
 body {
    font-family:'Open Sans', 'sans-serif';
}
.mega-dropdown {
    position: static !important;
}
.mega-dropdown-menu {
    padding: 20px 0px;
    width: 100%;
    box-shadow: none;
    -webkit-box-shadow: none;
}
.mega-dropdown-menu > li > ul {
    padding: 0;
    margin: 0;
}
.mega-dropdown-menu > li > ul > li {
    list-style: none;
}
.mega-dropdown-menu > li > ul > li > a {
    display: block;
    color: #222;
    padding: 3px 5px;
}
.mega-dropdown-menu > li ul > li > a:hover, .mega-dropdown-menu > li ul > li > a:focus {
    text-decoration: none;
}
.mega-dropdown-menu .dropdown-header {
    font-size: 18px;
    color: #ff3546;
    padding: 5px 60px 5px 5px;
    line-height: 30px;
}
.carousel-control {
    width: 30px;
    height: 30px;
    top: -35px;
}
.left.carousel-control {
    right: 30px;
    left: inherit;
}
.carousel-control .glyphicon-chevron-left, .carousel-control .glyphicon-chevron-right {
    font-size: 12px;
    background-color: #fff;
    line-height: 30px;
    text-shadow: none;
    color: #333;
    border: 1px solid #ddd;
}

JavaScript

$(document).ready(function () {
    $(".dropdown").hover(

    function () {
        $('.dropdown-menu', this).not('.in .dropdown-menu').stop(true, true).slideDown("400");
        $(this).toggleClass('open');
    },

    function () {
        $('.dropdown-menu', this).not('.in .dropdown-menu').stop(true, true).slideUp("400");
        $(this).toggleClass('open');
    });
    $('#about_us_dropdown').slideDown();
    $('#about_us_dropdown').toggleClass('open');
});