i have an airport extreme can i share screen?

i just gut the airport extreme and i have little question
i have iMac(10.5.2)
and
MacBook air (10.5.2)

can i share screen(between them)? how? and can I do it wen my iMac at home and my macbook not there on the same internet connection?

thanks, omri
(there is any software that do it for free?
i have .mac)
-sorry abut my english-

Yes you can share the screens set your user Preferances like this on both your Macs
Click for full size - Uploaded with plasq's Skitch

The back to your Mac feature I have never used sorry. It is however possible so they tell me
Good luck and congrats with the new Air

Welcome aboard, omris! Try Log Me In, it is a version of the hamachi protocol:
http://logmein.com
I think that will take care of the problem with accessing your Mac on a different sub-net.

so nice thanks you people!!
i will try and tell you soon...
thanks!
omri

it work's really good!
look at the photo... its amazing!!
http://skitch.com/omri/jy83/picture-1

Well done