Your list items add up to more than 650px wide, so it has to put the last item on the line below the rest. The relative positioning used makes it a bit more difficult to diagnose properly.
You can easily see this by setting the width of #menus in menutabs.css to 700px, which is wide enough to contain all the items. If you do this, you'll also need to change the "left: -180px;" to "left: -150px;" in the last li. And by the way, your DOCTYPE is incorrect, you need to include the full URL of the DTD like this "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";. Robert M. ***************************************************** The discussion list for http://webstandardsgroup.org/ *****************************************************
