Rebulid All option in Project Menu is not there in eclipse 3.1. Project Menu contains Build All Build Project Build Automatically options which should be used in place of Rebuild All or is there any option.
In 3.2, you would use the "Clean..." dialog. Not sure whether that was already there in 3.1.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus