How to get script to bypass app message

Question

I've got a script to automatically update a remote FileMaker database which I run using iCal.
The script works fine unless someone has the database open at which time Filemaker opens a message window asking to send a message to the guests (that have the database open) to close the file.
How can I get the script to select the "ask" button so that Filemaker will close the database and copy the file?
Is there some way I can use a "System Events" keystroke command to return the "ask" button?
Attached is the script.
Pedro
with timeout of 300 seconds
tell application "Finder"
say "The ePO database will now back itself up. The database will need to close itself for a few moments and then reopen."
set dd to display dialog "The ePO database will now back itself up. The database will need to close itself for a few moments and then reopen.
(Use a maximum of 24 characters)" buttons {"OK", "cancel"} default button "OK" giving up after 10
delay 2
set fileRef to "Photo [Work]:CPA Photo Order Database:CPA ePO forms.fp7"
set theFile to a reference to file "Photo [Work]:CPA Photo Order Database:CPA ePO forms.fp7"
end tell
tell application "FileMaker Pro"
try
close database "CPA FM Log"
end try
try
close database "CPA ePO forms"
end try
end tell
tell application "Finder"
activate
move fileRef to "Photo [Data]:CPA Photo Order Database:" with replacing
--move fileRef to "FREE SPACE:iView Catalog backup:" with replacing
end tell
tell application "Finder"
set fileRef to "Photo [Work]:CPA Photo Order Database:CPA FM Log.fp7"
set theFile to a reference to file "Photo [Work]:CPA Photo Order Database:CPA FM Log.fp7"
end tell
tell application "Finder"
move fileRef to "Photo [Data]:CPA Photo Order Database:" with replacing
end tell
tell application "FileMaker Pro"
activate
open "Photo [Work]:CPA Photo Order Database:CPA FM Log.fp7" for Accounts "Photo" with passwords "Photo"
open "Photo [Work]:CPA Photo Order Database:CPA ePO forms.fp7" for Accounts "Photo" with passwords "Photo"
end tell
end timeout
G5 Mac OS X (10.3.8)
G5   Mac OS X (10.3.8)  

Answer 1

Sorry I was not clear the first time.
That works fine as far as bypassing the message.
But what I really want the script to do is to have FileMaker send a message to users who are logged on asking them to close the database and then automatically disconnect users in 25 seconds.
This is something Filemaker does when you manually close the database when other users have it open, I just need to get the script to "push the right buttons" so to speak.
Pedro
G5 Mac OS X (10.3.8)