title: Simple Javascript to change a header image based on Domain name
body: <p>I'm struggling here.</p>
  
  <p>I need to change an image in our header based on the domain name that the user entered.</p>
  
  <p>We have 2 domains that point to the same location.  We have a header image map that is called.  </p>
  
  <pre><code>&lt;img src="header_image.png" border="0" width="1113" height="200" orgWidth="1113" orgHeight="200" usemap="#image-maps-2014-08-15-144022" alt="" /&gt;
  </code></pre>
  
  <p>This is the image I need to change.</p>
  
  <p>Just want the header image to be "header_image1.jpg" when user us at www.domain1.com and "header_image2.jpg" to be displayed when at www.domain2.com</p>
  
  <p>It should be simple.  But I'm just lost, any help would be greatly appreciated.</p>
  
  <p>Thank you.</p>