About Display 2 Cameras for S3D function....

Experts~

In my project, i set double-camera for stereoscopic 3d ,and i would like to capture image seq. of both camera. however, when i play the game, the game view only display one camera view but not both, so i can't screenCap both left & right camera at the same time. Am i missing something in my script?

here's the script i use for s3d cam setting: http://www.hitlab.utas.edu.au/wiki/Stereoscopic_3D

and the screen cap function: http://wiki.unity3d.com/index.php/ScreenShotMovie

p.s: Mac OS system~ Thanks Experts~