The error in R while using bugs.R function

Dear R users, 
 
I followed the instuctions on Dr. Gelman's web to install all
of documents that bugs.R needs, but when I try to run the school example that the web posted in R, I got an error: couldn't find function "bugs", what's wrong?

Have you forgot to source() Andrew's bugs.R file?

Anyway, you might want to give the CRAN package R2WinBUGS a try, which 
is based on Andrew's code known as "bugs.R".
There is also a developer version BRugs (an interface to OpenBUGS) 
available at http://www.statistik.uni-dortmund.de/~ligges/BRugs/ (will 
move to CRAN very soon now).

Uwe Ligges

 
Thanks,
 
Jia

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