jforum sso

Hello everyone,
I need to integrate (or enable single sign on ) jforum and a web application
the web application comes with a protected folder with a declared security constraint accessed thru a login form of the type :
<form method="POST" action="j_security_check">
<input type="text" name="j_username">
<input type="text" name="j_password">
</form>

Thanks for taking time to reply