I think you're wanting something like this as shown in this jsFiddle
<style>
div#left ul{list-style:none;font-weight:bold;}
div#left ul li{display:inline-block;}
</style>
<div id="left">
<ul>
<li>
<a href="index.html">Home</a>
</li>
<li>
<a href="listing.html">Listing</a>
</li>
<li>
<a href="financing.html">Financing</a>
</li>
<li>
<a href="contact.html">Contact</a>
</li>
</ul>
</div>