[Dynapi-Help] dynapi.onUnload question

[Jesse Vitrone]

I have a page where the user is moving some layers around, and I want to 
make sure they save before they leave the page, so I'd like to promt 
them with a warning if the page is unloading and they haven't saved.

To do that, I need to stop the page from unloading if they want to 
save.  What can I do with dynapi.onUnload to stop the page from 
unloading?  Is it possible?

Thanks in advance,
   Jesse Vitrone
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