Simple script doesn't work

[Timothy Miller]

In certain frequently-used stacks, I get tired of closing the revTools window, choosing the browse tool, and so on.

Y this script no work?

on OpenCard
   choose browse tool
   close  window revTools
   close window revStartCentre
end OpenCard

I've tried on openCard, on preOpenCard, on openStack, preOpenStack. I get bupkis. And close window revStartCentre throws an error, even though it works in the message box.

What am I doing wrong?

Tim