Block show the default VtigerCRM Confirmation box to let them decide something.
You could configure the text, the User see.
This configuration result into this in Frontend:

Enter your comment. Wiki syntax is allowed:
   ___    __   _   __   ____   ___ 
  / _ \  / /  | | / /  / __/  / _ )
 / ___/ / /__ | |/ /  / _/   / _  |
/_/    /____/ |___/  /_/    /____/