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:
  __  __  ____   __ __  _____   ____
 / / / / /_  /  / // / / ___/  / __/
/ /_/ /   / /_ / _  / / /__   / _/  
\____/   /___//_//_/  \___/  /_/