Retaining artwork from WMA files

Greetings All...

I have a specific question.

I have purchased the Danuisoft program for converting my WMA music files to mp3 so that I may transfer them to my 80g ipod video. The program works just fine, but I do not know how to retain the original LP artwork that is inherent within the original WMA file. Artwork does not transfer over once they have been converted to mp3. Is there a special box that needs to be checked in itunes? What do I do? Thanks in advance for your help.