drop down menu

<div id="cssmenu">
<ul>
<li class="has-sub"><a href="#"><span>Teacher Zone</span></a>
<ul>
<li><a href="#"><span>Widgets</span></a></li>
<li><a href="#"><span>Menus</span></a></li>
<li class="last"><a href="#"><span>Products</span></a></li>
</ul>
</li>
<li class="has-sub"><a href="#"><span>Student Zone</span></a>
<ul>
<li><a href="#"><span>Widgets</span></a></li>
<li><a href="#"><span>Menus</span></a></li>
<li class="last"><a href="#"><span>Products</span></a></li>
</ul>
</li>
<li class="has-sub"><a href="#"><span>Official Zone</span></a>
<ul>
<li><a href="#"><span>Widgets</span></a></li>
<li><a href="#"><span>Menus</span></a></li>
<li class="last"><a href="#"><span>Products</span></a></li>
</ul>
</li>
<li class="has-sub"><a href="#"><span>News Zone</span></a>
<ul>
<li><a href="#"><span>About</span></a></li>
<li class="last"><a href="#"><span>Location</span></a></li>
</ul>
</li>
<li class="has-sub"><a href="#"><span>Employment Zone</span></a>
<ul>
<li><a href="#"><span>Widgets</span></a></li>
<li><a href="#"><span>Menus</span></a></li>
<li class="last"><a href="#"><span>Products</span></a></li>
</ul>
</li>
<li class="has-sub"><a href="#"><span>Extra Zone</span></a>
<ul>
<li><a href="#"><span>Widgets</span></a></li>
<li><a href="#"><span>Menus</span></a></li>
<li class="last"><a href="#"><span>Products</span></a></li>
</ul>
</li>
</ul>
</div>