you can take your keyboard apart and clean it. http://www.howtocleanstuff.net/how-to-clean-a-laptop-keyboard/
that might fix the problem. http://www.youtube.com/watch?v=0qRpz177gZ4
this video is more helpful. If it's a sticky spill, i've always used minor amounts of rubbing alcohol and a q tip. if you do this, make sure you give it a good 24 hrs to make sure it's dried out before putting it back together.