You're closing the list item when you've got a sub list below it - they shouldn't close until after the sublist - so you've got this for instance:
HTML Code:
<ul id="nav">
<li><a href="./">Home</a></li>
<li><a href="#">Company Info</a></li>
<ul>
<li><a href="./about.html">About Us</a></li>
<li><a href="./faq/">F.A.Q.</a></li>
<li><a href="./testimonials/">Testimonials</a></li>
<li><a href="./blog/">Company Blog</a></li>
</ul>
</li>
If you remove the unwanted </li> after "Company & Info" and where it appears in other places then it should be ok.
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