How to Override MMB on Mac OS 10.6.8

is there a way to override Mac system shortcuts in blender? Im thinking about MMB becouse i can not rotate in blender with it now.

Tnx for any help

With the mouse having a middle mouse connected to the system,
go to system preferences>>Mouse settings
and set the middle mouse button to button 3. It should work.

Alternately the ‘Alt(option)+shift+click’
emulates the middle mouse button which has to be enabled
from user preferences within blender.

Tnx @Sumazure for help but found that this time i had to turn off all muse buttons in Expose & Spaces. Now it works greate.