Replacing Header with existing site Navigation and header

I am integrating wp into an existing site – currently using the twenty ten theme. I want to replace the twenty ten header and navigation with what I have on the rest of the site – is this possible?

I’ve added the styles to the theme style.css file, and added the header div into the header.php file, but not sure what php code to delete, etc.

https://www.brandforwardgroup.com/news

Header and nav-bar pretty simple:

<div id="header">
   <div class="nav-bar">
  	<ul id="nav">
            <li class="home"><a href="index.html">Home</a></li>
            <li class="about"><a href="about.html">ABOUT</a></li>
            <li class="capabilities"><a href="capabilities.html">CAPABILITIES</a></li>
            <li class="work"><a href="work.html">WORK</a></li>
            <li class="news"><a href="news.html">NEWS</a></li>
   	    <li class="contact"><a href="contact.html">CONTACT</a></li>
        </ul>
   </div>
</div>