pop-up blocker on macbook pro?

HI,

I just got my macbook a few weeks ago. I own an Imac as well. I like playing on 'pogo.com' and on my imac I never had a 'pop-up blocker' but on my macbook I do.
When Im online trying to play the games, it says to press: "ctrl, or shift or alt'' and it should allow the screen to pop-up but that doesnt help.

I never installed anything different than whats included with the original package. Is there a new type of protection on these macs? My model is osx is 10.4.11

any help appreciated.

Thanks