Thank you for your post.
I've been working on this for a few minutes, not having much luck. I can definitely have the button not active via Instant Web Publishing, but I cannot apply conditional formatting to a button to make it disappear.
To make the button inactive, insert the following script steps to your button script:
If [ Left ( Get ( ApplicationVersion ) ; 3 ) = "Web" ]
This checks to see if the user is using Instant Web Publishing. If so, then halt the script, and no action is taken.
Does anybody else out there have a way to make the button disappear?