Auto Authenticate Wireless Network?

The wireless network at my University authenticates the user at the browser level (network appears unprotected, but once you are connected, any http request is intercepted, and the user is forwarded to a login screen where he must enter his credentials). After entering the credentials, he is automatically forwarded to the url he first attempted to access (rediurl variable)

I have valid credentials, but for several different reasons, I am trying to find a way to have my computer automatically enter this credentials for me without having to go to the login screen, and re-submit the credentials) I obviously use autocomplete, but one of the main reason I am trying to do this, is because the sessions times out every 3 hours, so if I want to remote access my desktop, I can only do within 3 hours of the last authentication. After that, the desktop is unreachable.

This authentication page has a simple form that sends the following values: http://x.x.x:8000/index.php?redirurl...ass=mypassword (auth_user and auth_pass are hidden values)

Does anyone know of a way to automatically, periodically, re-submit the credentials? Through URL, or any other way?