PageUp and PageDown keys for Irssi (IRC) in Macbook? I cannot find the keys on my mackbook. I need them to go page-up and page-down in irssi (IRC). I have tested the tips here but they do not work. They model some different Up/Down, not the traditional Up/Down as on larger keyboards.

How can I press PageUp and PageDown buttons with Macbook? Irssi is running behind ssh and GNU Screen with UTF8 support.
It took me a while to guess that and I didn't find anything on Google, so at least, if somebody needs it, it's fn + Up/Down in iTerm 2.