You should go meticulously over your PHP code and cleanse this out and also all of the CMS code.
When in need of help you could consider:
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To contact this expert here: http://aw-snap.info/file-viewer/
Redleg is testing some new code now and he will be back online shortly. His help is free of charge.
You can also reach him here: http://www.web-malware-removal.com/website-malware-removal/
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A paid cleansing service can be found here from Bruce Jackson’s Internet Security in Austria (English/German):
http://www.web-malware-removal.com/website-malware-removal/
polonus