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Listamatic: Eric Meyer's Simple Separators

http://css.maxdesign.com.au/listamatic/vertical06.htm

#navlist
{
padding-left: 0;
margin-left: 0;
border-bottom: 1px solid gray;
width: 200px;
}

#navlist li
{
list-style: none;
margin: 0;
padding: 0.25em;
border-top: 1px solid gray;
}

#navlist li a { text-decoration: none; }

<div id="navcontainer">
<ul id="navlist">
<li id="active"><a href="#" id="current">Item one</a></li>
<li><a href="#">Item two</a></li>
<li><a href="#">Item three</a></li>
<li><a href="#">Item four</a></li>
<li><a href="#">Item five</a></li>
</ul>
</div>