(mx) simple login page in flash

I need a simple login for an interactive cd I’m doing I don’t need it to be password protected or anything I just need to set it up so when a user types in text in two fields it allows then to proceed to the interface and when they don’t a pop up box says “please sign in” or whatever. If anyone knows of any tutorials or wouldn’t mind dropping a quick example here it would be much appreciated, thanks :).