Stop Gmail's chat from updating status automatically?

It really annoys me that whenever I move my mouse to the gmail window to reply to an em开发者_JAVA百科ail, my status in chat becomes available automatically. Gmail provides no way to disable this default behaviour. So I am thinking to write a greasemonkey script to disable this. Basically, I am thinking to enable this only when my mouse is moved into the chat frame or I am currently chatting. But I only have limited knowledge of javascript and gmail.

So is this gonna be very hard to do? or any hints on how this could be done?

Thank you!

Maybe it helps to use the GTalk program instead of the GMail build in solution.

You can also access the GTalk protocol (Jabber) with any major messenger http://www.google.com/support/chat/bin/topic.py?hl=en&topic=24670

These messengers have the option to control when switching from busy to available.