A link to the commercial might help. But I did some searching around and found that this one (link at the bottom) was the one that most people were asking about the music in. If that's the one you're talking about, then the song is called "Can't Get Enough" by The Infadels. I've also heard that "Don't Upset The Rhythm" by The Noisettes is in another commercial, so you might try that one as well.
Good luck, fellow ad music hunter!