Hello. I have a three button mouse for my iMac, since the Mighty Mouse is used for my MacBook. I really like the feature to press the fourth button on the MM to activate Spaces. Is there a software I can use to map my three button mouse to do the same (or a keyboard command like F5), by pressing two buttons on that mouse like middle button (wheel) and right mouse button at the same time? Or could this be done by script, that "listens" and when the action occurs it follows a set command? Thanks in advance.