if you want to use an image you found on the web, download it, resize it on your computer (if you have a graphics program, otherwise sonicgirl and wing have volunteered to do this part), then upload it to some webserver. if you have space at geocities.com/ubertar/ , just upload the graphic like you would any photo on your website, and enter the appropriate url in your profile here, like
http://geocities.com/ubertar/avatar.gif. I'm not sure if you're being facetious or not, given that enormous avatar there (as you can see, it throws off the layout of the entire page). Also, for those without webserver space, it seems from hillary's last post that there is space available on the tapeop server for member avatars (correct me if I'm wrong), so you could just email your resized avatar to hillary (again, if i'm overstepping...) and she would give you the appropriate url to enter in your profile.