Action if isset..php/javascript

I am storing a session variable when a comment is inserted.. called user_message.. and i want to, when user_message, have been stored, THEN, show message on index.php index.php is right now:
But you will need to refresh(f5) the site, to see the message AFTER its stored.. But i want to if variable user_message has got stored something, then displays it.. Hope you understand.
How are you saving the comment? Ajax? Show some code.

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