Extra `mouse' button on a Thinkpad T21

I've been working with getting Debian running in all its glory on an IBM Thinkpad T21, and am pretty pleased -- except for one tiny issue. The T21 has a large button with a blue marking underneath the left- and right-`mouse' buttons. Under Windows, this is used as a scroll button. I'd like to se

Extra `mouse' button on a Thinkpad T21

I've been working with getting Debian running in all its glory on an IBM Thinkpad T21, and am pretty pleased -- except for one tiny issue. The T21 has a large button with a blue marking underneath the left- and right-`mouse' buttons. Under Windows, this is used as a scroll button. I'd like to s