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:
  __  __   _  __  ____   _   __   __  ___
 / / / /  / |/ / / __ \ | | / /  /  |/  /
/ /_/ /  /    / / /_/ / | |/ /  / /|_/ / 
\____/  /_/|_/  \____/  |___/  /_/  /_/