Customize Password Alert Popup Box Message

When I password protect my PDF documents and a user opens it, the generic alert box appears requesting the user to "Enter Password"
 
The popup is named "Password". I'd like to change that name...
Also, I'd like to customize the default message which is simply " 'filename' is protected. Please enter a Document Password."
 
I need to inform users of where they can find the document passwords. The current message is too short & vague.
 
I am using Acrobat 9 Pro as part of CS 4.
 
Thanks in advance.
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