Код HTML очень прост - только неупорядоченный список:
<ul id="project-list">
<li><a href="#">Civil Engineering</a>
<ul>
<li><a href="#">Cowley Hall Parking Lot Recontruction</a></li>
<li><a href="#">Culver’s Home Office</a></li>
<li><a href="#">First Addition to Highland Addition</a></li>
<li><a href="#">Fox Point Apartments</a>
<ul>
<li><a href="#">East Side</a></li>
<li><a href="#">West Side</a></li>
</ul>
</li>
<li><a href="#">Metropolitan Place Phase II</a></li>
<li><a href="#">Oak Park Place of Baraboo</a></li>
<li><a href="#">Premier Coop</a></li>
<li><a href="#">Sleep Inn & Suites</a></li>
<li><a href="#">Tradewinds Business Center</a></li>
<li><a href="#">UW-Madison Nielsen Tennis Stadium</a></li>
</ul>
</li>
<li><a href="#">Environmental Engineering</a></li>
<li><a href="#">Telecommunications Engineering</a>
<ul>
<li><a href="#">Nsight TeleServices (CellCom) Wisconsin</a></li>
<li><a href="#">Oakland County/Radian Communications Michigan</a></li>
<li><a href="#">T-Mobile Site Deployment</a></li>
<li><a href="#">U.S. Cellular Network Development</a></li>
<li><a href="#">Western Wireless South Dakota</a></li>
</ul>
</li>
</ul>

<style type="text/css">
/*
CSS-Tricks Example
by Chris Coyier
http://css-tricks.com
*/
* { margin: 0; padding: 0; }
body { font: 16px Georgia, serif; }
a { text-decoration: none; }
ul { list-style: none; }
#page-wrap { width: 500px; margin: 0 auto; }
#project-list {
background:transparent url(images/graypixel.png) repeat-y scroll 15px 0;
width:340px;
}
#project-list li {
font-size:16px;
margin:15px 0 20px;
padding:0 0 0 10px;
}
#project-list li a {
background:white none repeat scroll 0 0;
color:#1F6DD9;
display:block;

padding:3px;
}
#project-list li a:hover {
color:#84B8FF;
}
#project-list li ul li {
background:transparent url(images/graypixel.png) repeat-x scroll 0 8px;
font-size:13px;
margin:4px 0 4px 5px;
padding:0 0 0 20px;
}
#project-list li ul li a {
padding:0 0 0 3px;
}
#project-list li ul li ul {
background:transparent url(images/graypixel.png) repeat-y scroll 15px 0;
margin-bottom:10px;
}
#project-list li ul li ul li {
margin-left:16px;
padding-left:10px;
}
</style>