Camera Switcher

This is another Louis Marcoux script and is quite popular because it does away with batch rendering, allowing you to render out your animation in one hit, regardless of the number of cameras in your scene.
Download it HERE.

Use this link for a complete explanation of how to use it.  http://area.autodesk.com/blogs/louis/switching_cameras_in_an_animation_in_3ds_max 
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