Virus in my Dolphin????

Does anyone have any idea what could cause this error?  My virusscanner and several other virusscanners can detect these files as viruses. I have contacted my webhostingcompany and they have scanned my web and they could not find anything.

18-09-2011 10.34.01 SYSTEM 296 Sign of "JS:IFrame-DN [Trj]" has been found in //templates/tmpl_blue/images/arrow.png\{gzip}" file.
18-09-2011 10.34.02 SYSTEM 296 Sign of "JS:IFrame-DN [Trj]" has been found in /templates/tmpl_blue/images/footer_part.png\{gzip}" file.

Just for laughs, try clearing the /cache/ (except for the .htaccess file) and /cache_public/ directories. I can't find that template, which means it was probably removed.