Simple hover slideup and slidedown help

JavaScript
1

I’m trying to get my nav megamenu to slide down and up when the parent li is hovered over. After a few hours reading tutorials and scouring the web, I’m stumped. Could anyone give me a hand or point me in the right direction? I need #megaBox to slide up and down.

<script type="text/javascript">
	$(document).ready(function(){
		$('#mega li').hover(function(){
			$('ul', this).slideUp(0).stop(true, true).slideDown(400);
		},
		function(){
			$('#mega li div', this).css("display", "block").stop(true, true).delay(500).slideUp(500);
		});
	});
</script>

<ul id="mega">
<li><a href="#">Home</a>
<div id="megaBox">
Home
</div>
</li>
<li><a href="#">Forums</a>
<div id="megaBox">
Forums
</div>
</li>
<li><a href="#">Reviews</a>
<div id="megaBox">
Reviews
</div>
</li>
<li><a href="#">Previews</a>
<div id="megaBox">
Previews
</div>
</li>
<li><a href="#">Features</a>
<div id="megaBox">
Features
</div>
</li>
<li><a href="#">Game Database</a>
<div id="megaBox">
Game Database
</div>
</li>
<li><a href="#">Online Leagues</a>
<div id="megaBox">
Online Leagues
</div>
</li>
<li><a href="#">Site Info</a>
<div id="megaBox">
Site Info
</div>
</li>
</ul>

#mega {
	position:relative;	
}

ul#mega li {
	list-style:none;
	float:left;
	padding:10px 20px;
	font-size:16px;
	margin-top:8px;
}

#mega li a {
	color:white;
}

#mega li:hover {
	color:#061C39;
	background:white;
    -moz-border-radius-topleft: 4px;
    -moz-border-radius-topright: 4px;
    -moz-border-radius-bottomright: 0px;
    -moz-border-radius-bottomleft: 0px;
    -webkit-border-radius: 4px 4px 0px 0px;
    border-radius: 4px 4px 0px 0px;
	font-size:16px;
}

#mega li:hover a {
	color:#061C39;
}

#mega li:hover div {
	left:0;
	top:45px;
	position:absolute;
}

#mega div {
	color:#313131;
    font-weight: normal;
    left: -999em;
    margin-top: 1px;
    position: absolute;
    text-align: left;
    width: 1060px;
	min-height:200px;
background: rgb(255,255,255); /* Old browsers */
/* IE9 SVG, needs conditional override of 'filter' to 'none' */
background: url(data:image/svg+xml;base64,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);
background: -moz-linear-gradient(top,  rgba(255,255,255,1) 0%, rgba(222,222,222,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,1)), color-stop(100%,rgba(222,222,222,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top,  rgba(255,255,255,1) 0%,rgba(222,222,222,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top,  rgba(255,255,255,1) 0%,rgba(222,222,222,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top,  rgba(255,255,255,1) 0%,rgba(222,222,222,1) 100%); /* IE10+ */
background: linear-gradient(top,  rgba(255,255,255,1) 0%,rgba(222,222,222,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#dedede',GradientType=0 ); /* IE6-8 */
}