Modal Pop-up

[Bruce Button]

I want to create a modal pop-up layout with two buttons, say "Select" 
and "Cancel". When the user presses "Select" one action must happen, and 
when the user presses "Cancel" another action must happen.

I have set up the layout as follows:
   New Window
   Go To Layout
   Allow User Abort[Off]    // to make the layout modal
   Pause/Resume Script[Indefinitely]

I can get the script to resume by assigning the Resume Script script 
step to a button, but how do I distinguish between the buttons? If I 
assign a separate script to each one, then the original script (as 
above) remains active and paused. There seems to be no way to restart 
that script from another one.

(I'm using FMPro Advanced 8.5 on Windows XP.)

Any ideas would be greatly appreciated.

Bruce Button