How can I use iChat and/or Google Talk to talk to someone who has Yahoo messanger?

Ok...





My best friend has Yahoo messanger for IM.


I have 2 accounts: my iChat account and my Google Talk account. I will use either, whatever works the easiest.


We would like to chat with each other. Please tell us how!





Thanks!
How can I use iChat and/or Google Talk to talk to someone who has Yahoo messanger?
I don't know if yahoo is compatitable with google, you might want to install YIM 9 and then ya'll can talk for sure.