pop up message and exit script

This should be a very basic thing but making my first vbScript and not getting it.
I have a script that does a number of things, that part is ok.

The problem I have is:
When the script fist starts I want it to check to make sure a certain file does exists then if so create a backup copy of the file, if it does not exists then pop up message box with some info and exit the script.

What I have does check that the file exists and creates a backup of it and if not it does pop up the message box.

The problem I have is if the message pops up and says it did not find the file then if you click on ok it keeps on running the script and does not EXIT the script. I've tried puting in a Exit, Quit, Exit Function and so on but do not know enough about this yet so not working.

Also when I pop up the message box I cannot figure out how to format the message so I can have multiple lines in the message, what I have only works if the message is all on one line.

For example here is what I have:

Dim objFSO, objWSH, strFileName, strCmd
      set objFSO = CreateObject("Scripting.FileSystemObject")
      set objWSH = CreateObject("WScript.Shell")
      strFileName = "D:\Documents\Mail\test.txt"

   if Not objFSO.FileExists(strFileName) Then 'The file To copy is not present
WScript.Echo "The " & strFileName & " file was Not found On this computer"
   ?????       
    End if


I can add the else to make a backup copy and that's fine, it does pop up a message if the file is not found but if you say ok it does not Exit the script, also how can I add multiple lines to the message that pops up?


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