You should try to indent your code more often to make it a bit more readable for others.
Your menu's HTML was a bit messy so I changed it a little. Have a look at this fiddle: http://jsfiddle.net/csYjC/1729/
The menu HTML should be structured as follows:
<ul>
<li><a href="#">Home</a></li>
<li><a href="#">Feedback</a>
<ul>
<li><a href="#">Level 1</a>
<ul>
<li><a href="#">Level 2</a>
<ul>
<li><a href="#">Level 3</a></li>
<li><a href="#">Level 3</a></li>
<li><a href="#">Level 3</a></li>
</ul>
</li>
<li><a href="#">Level 2</a></li>
<li><a href="#">Level 2</a></li>
</ul>
</li>
<li><a href="#">Level 1</a></li>
<li><a href="#">Level 1</a></li>
</ul>
</li>
<li><a href="#">About Us</a></li>
<li><a href="#">Contact US</a></li>
</ul>
You should modify the CSS code to your own advantage. The drop-down menu concept is what you really should be looking at.