[jQuery] IE 8 jquery corners problem

[jQuery] IE 8 jquery corners problem


This is inserting a white line in the middle of the div in IE8.
Problem doesn't exist in ff. Can you see a problem with my code?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://
www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>corners</title>
<style type="text/css">
.navoptionrow {
    float:left;
    font-size:.9em;
    }
.navoptionrow ul {
    float:left;
    background-color: #CDCDCD;
    width:890px;
    overflow:visible;
    }
.navoptionrow li {
    float:left;
    list-style-type:none;
    margin-right:10px;
    }
</style>
<script type="text/javascript" src="../jquery/jquery.js"></script>
<script type="text/javascript" src="../jquery/corners.js"></script>
<script type="text/javascript">
$(function(){
    $('.rounded').corners();
});
</script>
</head>
<body>
<div class="navoptionrow">
<ul class="rounded">
<li>
<h3>Clients</h3>
</li>
<li class="anavlink"><a href="../clientAdmin/
newclient.php">New Client</a></li>
<li class="anavlink"><a href="../accountAdmin/
newAccount_1.php">New Account</a></li>
<li class="anavlink"><a href="../accounts/index.php">Accounts</
a></li>
<li class="anavlink"><a href="../billing/
billingrequest.php">Request Invoice</a></li>
</ul>
</div>
</body>
</html>