I am getting a really weird JavaScript error when I run this code:
return
only makes sense inside a function. There is no function in your code.
Also, your code is worthy if the Department of Redundancy Department. Assuming you move it to a proper function, this would be better:
return confirm(".json_encode($message).");
EDIT much much later: Changed code to use json_encode
to ensure the message contents don't break just because of an apostrophe in the message.