310762 Picture Gallery sms

Hi i need a website with following requirements General idea Photographers can sign up and make an account, Upload there pictures in high quality at once. Visitors can see pics in low quality and donwload them in high quality on paying a small fee on sms Detail Photographer Can make a free account Their adress to visitors would be [login to view URL] In backoffice they can make category's-> Should be possible to give a name and keywords Upload pictures in bulk per category Should automaticly make small, low quality version of the pic to show in front office Visitor Can search on the keywords or go to direct link of the photgrapher Browe pictures on low quality When they want to download.. they get message on screen . . They get a message on the site to send an sms (example send "pic 02255" to 0000) the nr 02255 should be the numeric part of the picturename. Beneat this message should be the possibility to fill in the answer of the message (below) In return visitor gets a confirmationmessage with a number ,this number should be a calculation of the nr they sended.. If they type in this nr the picture will be downloaded to their computer. THe sms part is not important for u.. i will arrange that. Only must it pe possible to put the way of calculation in the system.. for confirmation.. so EXAMPLE Visitor wants to download picture DCS02255 He clicks download picture Message appears send "pic 02255" to 0000 for code Visitor sends this sms Response would be type in 6514 (formula used 2255*13/9*2) visitor types 6514 ok and can download the picture Again the sms part is not to be integrated in the site.. Only site needs to identify correct response (by checking formula)