Simple customization for a rapidleech php script

rapidleech is an opensource file download (premium link generator) script. i need to customize it in following way 1. change the home page and logo [login to view URL] file is downloaded to the server, user should share a given url on his facebook to unlock the download link. once it's shared and verified, user can download the file. - url's should be loaded from a comma separated text file. a random url must load from that list. - prompt to share on facebook and to verify it's shared can be easily done by the facebook developer API let me know if you need more clarification