pl/PgSQL: Samples doing UPDATEs ...

I have an older PostgreSQL book here, that has chapter on pl/PgSQL in it, 
but no good samples ....

What I'm looking for is a sample of a function that returns # of rows 
updated, so that I can make a decision based on that ... does anyone know 
where I could find such (and others, would be great) online?

Thanks ...

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Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy@hub.org           Yahoo!: yscrappy              ICQ: 7615664