Add simple redirection at login

What happen :

An user try to call http://identi.ca/index.php?action=newnotice&status_textarea=Hello

In this case, the guest is asked to login. After his login, he is redirected on his own profile. The message "Hello" is lost.

Which case ?

I'm developping an Identi.ca sharing button for my website. In major cases, the guest is not yet loged in.

How to resolv it :

When the login success, check is the precedent page was /index.php?action=newnotice&status_textarea=
If true, redirect on it, if false, continue to the profile page of the user.