<div id="menubar">
<ul>[*]link[*]link[*]link[*]link[/list]
</div>

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css:
#menubar ul {margin: 0px; padding: 0px; list-style-type: none;}
#menubar li {margin: 0px; padding: 0px; float: left; display: block; width: Npx; height: Npx;}
#menubar a {display: block; float: left; width: Npx; height: Npx;}

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io con questo sistema non ho problemi neanche con internet explorer.