title: Script to change webpage header based on domain name
body: <p>Is there an easy way to swap a file url based on domain name?</p>
  
  <p>I've acme.com &amp; acme.co.uk site domains which require different header graphic but are  otherwise identical content. Rather than managing two sets of files and CMS, is there a JS/php script or other method to change the header graphic url dynamically based on which domin name is accessed? Site is basic XHTML &amp; CSS. </p>