CSS - Compatability Issue Rollover Menu

 ul#navlist
{
padding: 0;
margin: 10;
list-style-type: none;
float: center;
width: 85%;
color: #fff;
background-color: #000000;
}

ul#navlist li { display: inline; }

ul#navlist li a
{
float: center;
width: 5em;
color: #fff;
background-color: #000;
padding: 0.2em 1em;
text-decoration: none;
border-right: 1px solid #fff;
}

ul#navlist li a:hover
{
background-color: #369;
color: #fff;
}

<ul id="navlist">
<li><a href="#">Home</a></li>
<li><a href="#">Band<font face="Times New Roman">&nbsp;</font>Bios</a></li>
<li><a href="#">Multimedia</a></li>
<li><a href="#">Shows</a></li>
<li><a href="#">Lyrics</a></li>
<li><a href="#">Merchandise</a></li>
<li><a href="#">Contact</a></li>
<li><a href="#">Guestbook</a></li>
</ul>

html {
	margin:0;
	padding:0;
}

body {
	margin: 0;
	padding: 5px;
	font-family: verdana, arial, helvetica, sans-serif;
	font-size: 76%;
	background-color: #eee;
	color: #000;
}

.clear {
	margin:0;
	padding:0;
	clear:both;
	font-size:0;
	line-height:0;
}

/* Header container */

#header {
	margin: 0;
	padding: 0;
	border: 1px solid #000;
	color: #fff;
	text-align: center;
	background: url("images/classroom.gif") repeat-x;
}

img#logo {
	margin: 10px 0px 0px 0px;
	border: 4px solid #FFF;
}

#header h1 {
	margin: 5px 0px 5px 0px;
	font-size: 2.5em;
	font-weight: bold;
	letter-spacing: 0.125em;
}

#banner
{
	margin: 0;
	padding: 0;
	background: #235 url("images/banner.gif") no-repeat 50% 50%;
	border: 1px solid #000;
}
	
#banner img
{
	width: 0;
	margin-left: -200px;
	padding-left: 1px;
}

/*topNav Container */

#topNav {
	margin: 10px 0px;
	padding: 0;
/*	border: 1px solid #ff0;  */
}

#searchBox {
	margin: 0;
	padding: 0; 
	float: left;
	width: 150px;
	height: 125px;
	border: 1px solid #000;
	background: #FFF;
	text-align: center;
}

#nav {
	margin: 0px 0px 0px 153px;
	padding: 0px;
/*	border: 1px solid #0f0; */
}

#nav ul {
	list-style-type: none;
	margin: 0;
	padding: 0;
}

#nav li#nav-foundation, #nav li#nav-submission, #nav li#nav-recipients, #nav li#nav-volunteer {
	margin: 0px 0px 0px 8px;
	padding: 0;
	float: left;
	display: inline;
	width: 23%;
	height: 125px;
	border: 1px solid #000;
	background-repeat: no-repeat;
	background-position: 50% 100%;
}

#nav table {
	border-collapse: collapse;
}


#nav a.mainMenu {
	display: block;
	font-size: 18px;
	color: #FFF;
	background-color: #c7013f;
	text-decoration: none;
	text-align: center;
}

#nav ul ul {
	margin: 0 auto;
	padding: 0;
	display: none;
	width: 90%;
/*	border: 1px solid #0f0;  */
}

#nav ul ul li {
	margin: 4px 0px;
	padding: 0;
	border: 1px solid #fff;  
}

#nav table a {
	font-size: 15px;
	display: block;
	color: #fff;
	text-decoration: none;
	text-align: center;
	background-color: #c7013f;
}

#nav ul ul li a {
	font-size: 15px;
	display: block;
	color: #fff;
	text-decoration: none;
	text-align: center;
	background-color: #c7013f;
}


#nav ul li:hover a.mainMenu , #nav ul a.mainMenu:hover {
	background-color: #235;
}

#nav ul li:hover ul, #nav ul a.mainMenu:hover ul{
	display: block;
}

#nav ul ul li:hover a, #nav ul ul a:hover {
	background-color: #235;
}

	/* nav Headings

	#foundation #nav-foundation a.mainMenu, #submission #nav-submission a.mainMenu,
	#volunteer #nav-volunteer a.mainMenu, #recipients #nav-recipients a.mainMenu {
		background: #235;
	}

	#charter #nav-foundation ul, #committee #nav-foundation ul, #schedule #nav-foundation ul {
		display: block;
	}
	#charter #nav-foundation ul #nav-charter a, #committee #nav-foundation ul #nav-committee a,
	#schedule #nav-foundation ul #nav-schedule a {
		background: #235;
	}
*/

/* Side Navigation */

	#sideNav {
		float: left;
		width: 151px; /* 1px adjustment for no border */
		margin-right: 10px;
	}

	/* sideNav Boxes */

	#sideNav .box {
		margin-bottom: 10px;
		padding: 5px 5px 5px 50px;
		border: 1px solid #000;
		height: 90px;  /* add 10 for padding */
		background: #235;
		color: #fff;
		background-repeat: no-repeat;
	}

	#sideNav a {
		font-size: 1em;
		color: #fff;
		text-decoration: none;
	}

	#sideNav #calendar {
		margin: 0px;
	}

	#sideNav img {
		border-style: none;
		width: 150px;
		height: 150px;
	}


	
	#sideNav a:hover {
		font-weight: bold;
	}


/* Main Content Container */

	#main {
		float: auto;
		padding: 10px;
		border: 1px solid #000; 
		background: #fff;
		margin-left: 165px;
	}


/* Page Footer */

	#footer {
		clear: both;
		background: #235;
		border: 1px solid #000;
	
		color: #aaa;
		text-align: center;
	
		margin: 10px 0px 0px 0px;
		padding: 20px;
	}

	#footer a {
		color: #fff;
		font: underline;
	}

	#footer a:hover {
		font-weight: bold;
		letter-spacing: .1em;
	}

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Welcome!</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />


	<link href="style.css" rel="stylesheet" media="screen" type="text/css" />

</head>
<body>
<!-- Header -->
	<div id="header">
		<span>&nbsp<img id="logo" src="images/plexusLogo.jpg" alt="Plexus"/>&reg</span>
		
		<h1>Helping Hands</h1>
		
		<div id="banner">
			<img src="images/banner.gif" width="200" height="30" 
				alt="Providing Resources - Supporting Communities - Affecting Lives">
		</div>
	</div>

<!-- Navigation Menu -->

<div id="topNav">

	<!-- Search Box -->

	<div id="searchBox">
		Welcome, <b>John Doe</b>!
		[<a href="#">Admin</a>] [<a href="#">Sign Out</a>]
	  	<form action="" name="search">
	    		<input type="text" size="14" name="searchQuery" />
			
	    		<input type="submit" value="Search" />
	  	</form>
	</div>	

	<div id="nav">
	<ul>

		<li id="nav-foundation" style="background-image: url(images/foundation.jpg)">
			<a class="mainMenu" href="#">Foundation
<!--[if IE 7]><!--></a><!--<![endif]--><!--[if lte IE 6]><table><tr><td><![endif]-->
			<ul>
				<li id="nav-charter">
					<a href="#">Charter</a>
				</li>
				<li id="nav-committee">
					<a href="#">Committee</a>
				</li>
				<li id="nav-schedule"><a href="#">Schedule</a>
				</li>

				<div class="clear">&nbsp;</div>

			</ul><!--[if lte IE 6]></td></tr></table></a><![endif]-->
		</li>

		<li id="nav-submission" style="background-image: url(images/submission.jpg)">
		<a class="mainMenu" href="#">Submission
<!--[if IE 7]><!--></a><!--<![endif]--><!--[if lte IE 6]><table><tr><td><![endif]-->
			<ul>
				<li id="nav-guidelines">
					<a href="#">Guidelines for Giving</a>
				</li>
				<li id="nav-submit">
					<a href="#">How to Submit a Request</a>
				</li>

				<div class="clear">&nbsp;</div>

			</ul><!--[if lte IE 6]></td></tr></table></a><![endif]-->
		</li>

		<li id="nav-recipients" style="background-image: url(images/recipients.jpg)">
		<a  class="mainMenu" href="#">Recipients
<!--[if IE 7]><!--></a><!--<![endif]--><!--[if lte IE 6]><table><tr><td><![endif]-->
			<ul>
				<li>
					<a href="#">Sub One</a>
				</li>
				<li>
					<a href="#">Sub Two</a>
				</li>

				<div class="clear">&nbsp;</div>

			</ul><!--[if lte IE 6]></td></tr></table></a><![endif]-->
		</li>

		<li id="nav-volunteer" style="background-image: url(images/volunteer.jpg)">
		<a class="mainMenu" href="#">Volunteer
<!--[if IE 7]><!--></a><!--<![endif]--><!--[if lte IE 6]><table><tr><td><![endif]-->
			<ul>
				<li id="nav-program">
					<a href="#">Volunteer Program</a>
				</li>
				<li id="nav-tracking">
					<a href="#">Tracking Hours</a>
				</li>
				
				<div class="clear">&nbsp;</div>

			</ul><!--[if lte IE 6]></td></tr></table></a><![endif]-->
		</li>

	<div class="clear">&nbsp;</div>

	</ul>
	<div class="clear">&nbsp;</div>
	</div><!-- nav -->
	<div class="clear">&nbsp;</div>
</div><!-- topNav -->
<!-- Side Navigation -->

<div id="sideNav">

	<div class="box" style="background-image: url(images/CompanyEvents.gif)">
		<a href="#">Check out the events at Plexus!</a></div>
	<div class="box" style="background-image: url(images/CommunityEvents.gif)">
		<a href="#">Check out the community events sponsored by Plexus!</a></div>
	<div class="box" style="background-image: url(images/EventPhotos.gif)">
		<a href="#">Check out the photos from previous events!</a></div>
	<div class="box" style="background-image: url(images/AddEvent.gif)">
		<a href="#">Check out the photos from previous events!</a></div>
	<div id="calendar">
		<a href="#"><img src="images/calendar.jpg"/></a>
	</div>

</div>

<!-- Main Content -->

<div id="main">

	The Foundation's goal is to provide support that can have a meaningful impact in markets and communities that are strategically alligned with Plexus Corp.'s mission as the Product Realization Company. To accomplish this goal, the PCCF's charitable giving is allocated into three primary categories:
					<br /><br />
					<ul style="padding-left: 32px;">
						<li><b>1. Technology:</b> Supporting innovation and technology-related education</li>
						<li><b>2. Healthca </b> Enhancing the quality of medical care</li>
						<li><b>3. Community:</b> Making the communities we live in a better place</li>
					</ul>
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