Below is a copy of my dun script, it works with my ISPs(2). 
I've saved it to file on my hard drive at; 
 C:\Program Files\Accessories\Login\InetJunc.scp 
(the names have been changed to protect the innocent!:)

Make Sure & save your file with the .SCR extension.

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proc main

waitfor "Login:"
transmit "StewPitas<cr>"
waitfor "Password:"
transmit "privateword<cr>"

endproc