Page Count

Hi

I am not sure how can I start to code this, I need to write a function to count the page.
I have 2 master page, and there will be 2 body page, due to this, I cant use existing standard function to do form counting.

how can i start to code? using formcal and javascript?
where should i put the events?

or if there any better way??

Thanks for your help.