Allow users to draw and submit pictures

Hi, i want to make a flash where users can draw there own picture, by selecting the color, brush size, alpha and etc. And at the end they could submit the picture they drew in flash and it will be sent to my server, and then everybody can view the picture that was uploaded somehow. Please, can anyone help me?

SORT OF like this - http://www.xgenstudios.com/play/graffiti/

P.S - I alrady made the buttons and everything, but i dont know how to script this, i dont knoe how to let the users select the color by clicking on a button and start drawing, and also the submiting part. Thanks again!