"Sometime back Orkut added complete support for Google-Talk popup chat windows. This is different than earlier Google Talk integration where your Orkut friends gets added to Google Talk chat list automatically.Continue reading : [How To] Disable Google Talk Popup Chat Windows in Orkut
This recent integration opens all active Google Talk chat windows when you move from one Orkut window to another Orkut window seamlessly. This integration also works while switching between Gmail and Orkut.
I personally find this very annoying as I keep open Gmail all the time and prefer to use Gmail chat version of Google Talk..."
Posted by Rahul Bansal @ Orkut Diary