i can't remember what site i got this tip from but i tried it and it works great. :)
take an onion and cut it in half and put half in your basement. i put half on one side and half on the other. leave it for 24 hrs. and if you can stand the smell of the onion it will take away all the yuk smells.
it really worked. my basement had a funk to it that i couldn't get rid of no matter what i tried, but this worked. i left it down there for about 3 days and it's been about 3 months since then and it still doesn't smell.