Captive Portal

Hello ... maybe a stupid question,
I would like to redirect all authenticated users to specific page ... e.g. google.com
Will this work? Is it correct solution?

<form method="post" action="$PORTAL_ACTION$">
   <input name="auth_user" type="text">
   <input name="auth_pass" type="password">
   <input name="auth_voucher" type="text">
   <input name="redirurl" type="hidden" value="htp://google.com">
   <input name="accept" type="submit" value="Continue">
</form>


Thanks for any advice ...

I already found it ...
please ignore my prior post
thanks