Hi jenny, sorry for taking a little while to respond to you.
Please look at the code I have posted below, this should center the menu.
HTML Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div id="content">
<div id="navbar">
<ul id="nav" class="dropdown">
<li class="dir">abcdefghijk
<ul>
<li><a href="./">History</a></li>
<li><a href="./">Our Vision</a></li>
<li class="dir">
<a href="./">The Team</a>
<ul>
<li><a href="./">Brigita</a></li>
<li><a href="./">John</a></li>
<li><a href="./">Michael</a></li>
<li><a href="./">Peter</a></li>
<li><a href="./">Sarah</a></li>
</ul>
</li>
<li><a href="./">Clients</a></li>
<li><a href="./">Testimonials</a></li>
<li><a href="./">Press</a></li>
<li><a href="./">FAQs</a></li>
</ul>
</li>
<li class="dir">abcdefghijk
<ul>
<li><a href="./">Product Development</a></li>
<li><a href="./">Delivery</a></li>
<li><a href="./">Shop Online</a></li>
<li><a href="./">Support</a></li>
<li><a href="./">Training & Consulting</a></li>
</ul>
</li>
<li class="dir">Products
<ul>
<li class="dir"><a href="./">New</a>
<ul>
<li><a href="./">Corporate Use</a></li>
<li><a href="./">Private Use</a></li>
</ul>
</li>
<li class="dir"><a href="./">Used</a>
<ul>
<li><a href="./">Corporate Use</a></li>
<li><a href="./">Private Use</a></li>
</ul>
</li>
<li><a href="./">Featured</a></li>
<li><a href="./">Top Rated</a></li>
<li><a href="./">Prices</a></li>
</ul>
</li>
<li class="dir"><a href="./">Contact Us</a>
<ul>
<li><a href="./">Enquiry Form</a></li>
<li><a href="./">Map & Driving Directions</a></li>
<li><a href="./">Your Feedback</a></li>
</ul>
</li>
</ul>
</div>
</div>
</body>
</html>
Code:
#content { width:326px; margin:0px auto; }
#navbar { width:100%; }
ul.dropdown,
ul.dropdown li,
ul.dropdown ul { list-style: none; margin: 0; padding: 0; }
ul.dropdown { position: relative; z-index: 597; float: left; }
ul.dropdown li { float: left; line-height: 1.3em; vertical-align: middle; zoom: 1; }
ul.dropdown li.hover,
ul.dropdown li:hover { position: relative; z-index: 599; cursor: default; }
ul.dropdown ul { visibility: hidden; position: absolute; top: 100%; left: 0; z-index: 598; width: 100%; }
ul.dropdown ul li { float: none; }
ul.dropdown ul ul { top: 1px; left: 99%; }
ul.dropdown li:hover > ul { visibility: visible; }
/*--------------------------------------------THeme----------------------------------------------------*/
ul.dropdown { font-weight: bold; }
ul.dropdown li { padding-left: 5px; padding-right: 5px; padding-bottom: 0px; background-color: #000000; color: #ffffff; }
ul.dropdown li.hover,
ul.dropdown li:hover { background-color: #000000; color: #ffffff; }
ul.dropdown a:link,
ul.dropdown a:visited { color: #ffffff; text-decoration: none; }
ul.dropdown a:hover { color: #A8A8A8; text-decoration: none; }
ul.dropdown a:active { color: #ffa500; text-decoration: none; }
ul.dropdown ul { width: 150px; margin-top: 0px; padding-bottom:0px; }
ul.dropdown ul li { font-weight: normal; }