How do I get the smell of gasoline out of van carpet?

I bought gasoline for the lawnmower the other day and was transporting it home in the back of the minivan. It turned over and some of it leaked out. I soaked up what I could, but it was in the carpet pretty good. Is there anyway to get it out, or if not, is there anyway to neutralize the smell?

This topic was accidentally posted twice, so I’ll close this copy and direct comment to the other one, http://boards.straightdope.com/sdmb/showthread.php?&threadid=132811