Drop down effect of the menu is not working in IE( internet explorer) but work fine with other browsers

<ul id="menu">
            <li><a href="#">Home</a></li>
            <li><a href="#">About</a>
                <ul>
                    <li><a href="#">History</a></li>
                    <li><a href="#">Mission & Vision</a></li>
                </ul>
            </li>
            <li><a href="#">Project</a>
			<ul>
                    <li><a href="#">Yashodara</a></li>
                    <li><a href="#">SLC</a></li>
					<li><a href="#">CDP</a></li>
                    <li><a href="#">Avocacy</a></li>
              </ul>
			</li>
            <li><a href="#">Collaborate</a>
                <ul>
                    <li><a href="#">Sponsor a Child</a></li>
                    <li><a href="#">Donate</a></li>
                    <li><a href="#">Rupee one</a></li>
                    <li><a href="#">Volunteering</a></li>
                    <li><a href="#">Companies</a></li>
                </ul>
            </li>
            <li><a href="#">Gallery</a>
			<ul>
                    <li><a href="#">Image</a></li>
                    <li><a href="#">Vedio</a></li>
              </ul>
			</li>
			<li><a href="#">Report & Publication</a>
			<ul>
                    <li><a href="#">Anual Report</a></li>
                    <li><a href="#">Audit</a></li>
                    <li><a href="#">Expanses Pattern</a></li>
                    <li><a href="#">Publication</a></li>
              </ul>
			</li>
            <li><a href="#">Contact</a></li>
        </ul>

#menu, #menu ul
{
    margin: 0px;
    padding: 1px;
    list-style: none;
    float: right;
}
#menu
{
    min-width: 460px;
    margin-top: 58px;
    background: #0080C0;
    border-left: 2px solid #0080C0;
	border-top: 2px solid #0080C0;
    border-radius: 10px 0 0 0;
}
#menu:before, #menu:after
{
    content: "";
    display: table;
}

#menu:after
{
    clear: both;
}

#menu
{
    zoom: 1;
}
#menu li
{
    float: left;
    border-right: 1px solid #fff;
    position: relative;
}

#menu a
{
    float: left;
    padding: 12px 30px;
    color: #fff;
    text-transform: uppercase;
    font: bold 12px Arial, Helvetica;
    text-decoration: none;
}

#menu li:hover > a
{
    color: #fff;
    background-color: #4AA5FF;
    border-radius: 0px 0 0 0;
}

*html #menu li a:hover
{
    /* IE6 only */
    color: #ff0000;
}
#menu ul
{
    margin: 20px 0 0 0;
    _margin: 0; /*IE6 only*/
    opacity: 0;
    visibility: hidden;
    position: absolute;
    top: 40px;
    left: 0;
    z-index: 1;
    background: #444;
    background: linear-gradient(#444, #111);
    box-shadow: 0 -1px 0 rgba(255,255,255,.3);
    border-radius: 3px;
    transition: all .2s ease-in-out;
}

#menu li:hover > ul
{
    opacity: 1;
    visibility: visible;
    margin: 0;
}

#menu ul ul
{
    top: 0;
    left: 150px;
    margin: 0 0 0 20px;
    _margin: 0; /*IE6 only*/
    box-shadow: -1px 0 0 rgba(255,255,255,.3);
}

#menu ul li
{
    float: none;
    display: block;
    border: 0;
    _line-height: 0; /*IE6 only*/
    box-shadow: 0 1px 0 #111, 0 2px 0 #666;
}

#menu ul li:last-child
{
    box-shadow: none;
}

#menu ul a
{
    padding: 10px;
    width: 130px;
    _height: 10px; /*IE6 only*/
    display: block;
    white-space: nowrap;
    float: none;
    text-transform: none;
}

#menu ul a:hover
{
    background-color: #008ED2;
    
}
#menu ul li:first-child > a
{
    border-radius: 3px 3px 0 0;
}

#menu ul li:first-child > a:after
{
    content: '';
    position: absolute;
    left: 40px;
    top: -6px;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 6px solid #444;
}

#menu ul ul li:first-child a:after
{
    left: -6px;
    top: 50%;
    margin-top: -6px;
    border-left: 0;
    border-bottom: 6px solid transparent;
    border-top: 6px solid transparent;
    border-right: 6px solid #3b3b3b;
}

/*#menu ul li:first-child a:hover:after
{
    border-bottom-color: #000;
}*/

#menu ul ul li:first-child a:hover:after
{
    border-right-color: #0299d3;
    border-bottom-color: transparent;
}

#menu ul li:last-child > a
{
    border-radius: 0 0 3px 3px;
}
* html #menu             { zoom: 1; } /* IE6 */
*:first-child+html #menu { zoom: 1; } /* IE7 */

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script type="text/javascript">
        $(function () {
            if ($.browser.msie && $.browser.version.substr(0, 1) < 7) {
                $('li').has('ul').mouseover(function () {
                    $(this).children('ul').css('visibility', 'visible');
                }).mouseout(function () {
                    $(this).children('ul').css('visibility', 'hidden');
                })
            }
        }); 
    </script>