Well...
your code says:
Text Formatted Code
<img border="0" src="http://www.pocketmobile.net/layout/XP/images/logo.gif" width="240" height="83" alt="Pocket Mobile"></a>
but your image is 311*83px. I don't know the XP theme, but I would look in the header.thtml and adjust that size setting.
geKow