Small Php Work

Small work involving PHP and perhaps some mySql (not sure whether you would need the database). Basically, I need this: When a client clicks a 'Download' link, a new registration form should open (id the client has not registered with the site already). The registration form needs to collect some basic data (which will be given to you later) and these details need to be stored. If the client is already registered, they need to simply enter userID and Password. (So, there needs to be a 'Forgot Passowrd' function too, whereby the password will be sent via email). Once the user is logged in, they can download any publication and their login session will be active till they close the website or log out. This is it, in a nutshell. I know that the work is a small one for someone who has already done it. You may even have readymade code that you simply need to tweak in order to accommodate what we need. Pls bid accordingly. Thx.