Check status of session

Hi to all.
I have jsp pages in which i call (on submit of a form) javascript function in the same jsp page.
I would like to check in the function (on click of buttom from the user) if session has expired or not.
I have never used ajax.
I have only my web application with jsp page and js function in them.
What is code to do what i said early?
How could introduce (imports, etc.) ajax in my web application?
Thanks
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