[eluser]Johan André[/eluser]
Pretty simple, but you'll need to know the framework.
I think, unlike Demedes, that you should not start coding it but instead sketch out the project on paper.
The actual coding is the easy part and probably done in a couple of hours when you identified what it is you'll have to code.
Alot of the times when I just start coding it gets tossed away halfway through and not completed...
Good luck!