Welcome to Apple Discussions!
You have my sympathy!
First, turn off your Mac and place it with the keyboard on a towel. This should be treated like any other spill. You want any liquid to drain out. You do not want to risk any liquid making its way down to the logic board and causing much greater damage. So the first thing to do is to do your best to limit the damage to the keyboard. Leave your Mac off for at least 7 days.
Next, tell us exactly which Mac you have. You are in the section for the late 2008 MacBook. Is this the one you have? The keyboards are different for the different builds.
I am in the MacBook section by accident, so I don't really have the specific knowledge to help you other than to tell you to turn off your MacBook and wait for further advice. If you want to look at some instructions for fixing it yourself, here is a source:
http://www.ifixit.com/
Use a different computer until yours is fixed. As it stands, you may just need to replace the keyboard or upper case. If the liquid makes it to the logic board, it will be a much more expensive proposition to fix.
Good luck!