Heeelp! iframe add not showing complete

Guys:

I am trying to insert an iframe add in the top left of the body 300×250 box, but it always shows up cut off in Firefox. It only shows half of the height.

I have tried everything and has not worked.

This is the url:
http://www.team1228.com/banco-bicentenario-banco-universal

I really appreciate your help.