This is a quick hack that uses an invisible page-reload to determine if user has javascript enabled.

Makes these handy class vars available to all your controllers and views:

• @js — is javascript enabled?
• @ua[:ie] — is it IE-compatible?
• @ua[:ns] — is it Mozilla-compatible?
• @ua[:text] — is it text-only?
• @cookies_enabled — are cookies enabled
• @session_working — is session working?

(Also adds a handy helper that adds one or more parameters to an arbitrary URL.)