Equal and Opposite

If you have a Microsoft mouse or driver,

• Open properties control panel for mouse
  
• Check "Enabled program specific settings"
  
• Click "Settings..."
  
• Add... "eclipse"
  
• Rear thumb button... to "Keystroke"
  
• Set keystroke to "Alt+Left" (left arrow key)
  
• Same for forward thumb button
  

All done!

It would be nice if eclipse supported this natively?