How to make object(moon) dissappear after user enters his details

I have a assignment and it involves the following -

a) A full moon is there on the screen in which Name and Password field is there.
b)The movement the user types his name and password and after pressing enter the moon should fade for some other animation.

Is action script needed for this?.

Am just a sort of general flash animator I don’t know how to do things differently.

The animation further should continue where a steel door should open, two velvet ropes should be pulled aside which will make the bookcase wall swivels around to reveal the next animation…

Sounds impossible for me…very good planning is needed for this I guess…
but can someone tell me how to achieve point a and b.I will try pondering the rest on opening the steel door and pulling the velvet ropes that swivels the bookcase and goes to reveal another animation…