Format text fields based on radio button selection

(newbie) have form, part of uses 5 (5) radio button choices.  if "choice5" selected want field "x" (somewhere else in form) show red border.

need javascript action.

thanks!

add code mouse action each of radio-buttons:

 

this.getfield("x").strokecolor = event.target.valueasstring=="5" ? color.red : color.black;

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