Thanks Jason
How did you change;
<p><a href="/"><img alt="PowerCMS Demo" id="header-logo" src="http://powercms-demo.com/images/3afa6bab25/logos/customlogo.png" /></a></p>
In the CMS source, to;
<a href="/"><img alt="PowerCMS Demo" id="header-logo" src="http://powercms-demo.com/images/3afa6bab25/logos/customlogo.png" /></a>
In the webpage