Trying to center a dynamic width jquery menu. If you are trying to center the #menu inside the .top_navigation_bar then you could use the margin:0 auto and additionally use jQuery like this:
$menu = $('#menu');
$menu.outerWidth() - $menu.width()
// added the following line, because the lavalamp plugin
// corrects itself when the window resizes..
// so we trigger a resize event, and the plugin fixes everything ;)
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