Hugh,
how about something like the following (I'm obviously guessing the kind of markup and style you have, but hopefully you'll catch my drift - added coloured background for testing as well):
<div id="header">
<div id="navigation">
<div>the actual navbar</div>
</div>
</div>#header { position: relative; width: 400px; height: 250px; background: #fee; }
#navigation { position: absolute; left:0; bottom: 0; width: 100%; background: #ffe; text-align: center; }
#navigation div { margin: 0 auto; width: 250px; background: #eef; }
i.e. absolutely position a 100% wide container for the navbar, which also has text-align: center for IE compatibility, then you can use margin auto (or may as well leave it out now, after having used the text-align) for the fixed width navbar.
Patrick H. Lauke _____________________________________________________ re�dux (adj.): brought back; returned. used postpositively [latin : re-, re- + dux, leader; see duke.] www.splintered.co.uk | www.photographia.co.uk http://redux.deviantart.com
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