I couldn't spot the problem, but some CSS styling must be puhsing team.html down.
What puzzels me is why you have ./ when there are no sub-folders in path to file? Use ../indea.html (two ../ dots) when you are in a sub-folder and want to get out of that sub-folder to go to top-level home page or to another sub-folder. If you are two sub-folders deep, you use ../../index.html to get out of two sub-folders.
http://www.firsttexasmedicalpartners.com/sandbox/index.html
<div id="mainNav">
<ul>
<li class="thisNav homeNav"><a href="./index.html"><img src="images/home.png" height="23"</a></li>
<li><a href="./team.html">Our Team</a></li>
<li><a href="./index.html">Key Alliances</a></li>
<li><a href="./index.html">History</a></li>
<li class="lastNav"><a href="./index.html">Investors</a></li>
</ul>
</div>
From <link rel="stylesheet" href="./css/style01.css" type="text/css" />
#mainNav ul .thisNav a{ width:109px; height:40px; position:relative; top:-1px; color:#fff;
background:url(../images/mainNavButtons.png) -220px 0px no-repeat; border: 0px solid #fff; }
.homeNav { width: 40px !important; overflow:hidden; text-align:left; }
.homeNav img { margin:5px 0px 0px 10px; float:left; border:0; }
From <link type='text/css' href='./css/contact.css' rel='stylesheet' media='screen' />
/* * SimpleModal Contact Form * http://www.ericmmartin.com/projects/simplemodal/
* http://code.google.com/p/simplemodal/
* * Copyright (c) 2010 Eric Martin - http://ericmmartin.com
* * Licensed under the MIT license: * http://www.opensource.org/licenses/mit-license.php
* * Revision: $Id: contact.css 254 2010-07-23 05:14:44Z emartin24 $ */