CSS Hover Submenus Disappear in IE

<!--[if IE]>
<style type="text/css" media="screen">
body {
	behavior: url("/csshover3.htc");
	font-size: 100%;
}
#menu ul {
	width: 5em;
}
#menu ul li {
	float: left; 
	width: 100%;
}
#menu ul li a {
	height: 1%;
} 
</style>
<![endif]-->
 
/// START MAIN CSS
 
 
#menu-wrap {
	width: 100%;
	float: left;
	position: fixed;
	background: url('/site_graphics/new_top_bar_bkg.gif') left top repeat-x;
	z-index: 5000;
}
#menu {
	float: left;
	position:relative;
	width: 1040px;
	left: 50%;
	margin-left: -514px;
	z-index: 5000;
}
#menu ul {
	list-style: none;
	margin: 0;
	padding: 0px 0px 1px 0px;
	width: auto;
	float: left;
}
#menu a {
	color: #eaebeb;
	font-size: 10px;
	font-weight: bold;	
	display: block;
	border-left: 1px groove #b7b7b7;
	border-right: 1px groove #1e1e1e;
	margin: 0px;
	text-decoration: none;
	padding: 6px 20px;
}
#menu a:hover {
	background: #1e1e1e;
}
#national li.national, #world li.world, #business li.business, #politics li.politics, #entertainment li.entertainment,
#health li.health, #scitech li.scitech, #living li.living, #sports li.sports, #all li.all {
	background: #336699;
}
#menu li {
	position: relative;
	z-index: 5000;
}
#menu ul ul {
	position: relative;
	z-index: 5000;
	display: block;
	border-left: 1px groove #b7b7b7;
	border-right: 1px groove #1e1e1e;
	border-top: 1px groove #b7b7b7;
	border-bottom: 1px groove #1e1e1e;
	background: #484848;
}
#menu ul ul li {
	background: #484848;
	z-index: 5000;
}
#menu ul ul li a:hover {
	background: #1e1e1e;
	z-index: 5000;
}
div#menu ul ul {
	display: none;
	z-index: 5000;
}
div#menu ul li:hover ul {
	display: block;
	visibility: visible;
	z-index: 5000;
}
 
 
/// START HTML
<div id="menu-wrap">
<div id="menu">
<ul><li><a href="<?php echo "/all" . $adder ?>"><font color="#00CC00">Home</font></a></li></ul>
<ul><li class="national"><a href="<?php echo "/national" . $adder ?>">National</a></li></ul>
<ul><li class="world"><a href="<?php echo "/world" . $adder ?>">World</a></li></ul>
<ul><li class="business"><a href="<?php echo "/business" . $adder ?>">Business</a></li></ul>
<ul><li class="politics"><a href="<?php echo "/politics" . $adder ?>">Politics</a></li></ul>
<ul><li class="entertainment"><a href="<?php echo "/entertainment" . $adder ?>">Entertainment</a></li></ul>
<ul><li class="health"><a href="<?php echo "/health" . $adder ?>">Health</a></li></ul>
<ul><li class="scitech"><a href="<?php echo "/scitech" . $adder ?>">SciTech</a></li></ul>
<ul><li class="living"><a href="<?php echo "/living" . $adder ?>">Living</a></li></ul>
<ul><li class="sports"><a href="<?php echo "/sports" . $adder ?>">Sports</a></li></ul>
<?php
	if (isset($_SESSION['username'])) {	?>
	<ul><li style="width:160px; text-align:right;"><a href="" onclick="javascript:user_menu_start(); return false;"><font color="#FF6600"><?php echo "&#187;  "; ?>SyGood</font></a>
		<ul>
			<li style="width:160px;"><a href="/submit_new">Submit Link</a></li>
			<li style="width:160px;"><a href="/settings">Settings</a></li>
			<li style="width:160px;"><a href="/logout.php">Sign Out</a></li>
		</ul>
		</li>
	</ul><?php
} else { ?>
<ul><li><a href="/signin"><font color="#00CC00">Sign In</font></a></li></ul>
<ul><li><a href="/join"><font color="#00CC00">Join Now</font></a></li></ul><?php
} ?>
</div>
</div>

                                  

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