In install:
1. Right click on the icon, and choose "Save as..." Save it in a folder you will remember.
2. Go to your AIM window when logged in. Go to File -> Preferences -> Buddy Icon.
3. Click on your own screename.
4. Click on "Browse PC..."
5. Find the icon you saved.
6. Click "OK."
As always, please don't take these for your own webpage. Thank you!