System :: Mouse wheel doesn't work

Hi I'm running a Dell inspiron 1200 laptop with a Hard Disk install of DSL 3.3. It picked up my Radio Shack USB optical mouse ok since the buttons work just fine. But I get no scrolling via the mouse wheel. Does anyone know how I can get it to work? TIA

Boot with "xsetup" or select xsetup from the menu and restart X.

When it asks, select wheelmouse ;)

PS. Wheelmice use Imps/2 protocol

original here.