Water filling inside text effect

Hi,

I am trying to make a text effect where the colours fill up inside the logo lettering as if water was being poured in. Is there a way of doing this either by Actionscript or some form of advanced masking perhaps?

This is the type of effect I would like:

And to have it filling with the colours used in this logo.

http://www.khawkinsdesign.com/lola.html

Any help is appreciated.

KJoe