book forwarder

I need a php script to run on my web server. It will give a parameter defining the required books to be downloaded. After checking, the script will send an email giving the download details to the user and will also send two emails to my PC and will then terminate The user call will be <[login to view URL]> where 12345 is a parameter. First the module will check for a parameter being present at all. If no parameter it will assume 999 for the parameter. It will check for a valid parameter, any characters of letter "l" will be replaced by the number "1" and any character of letter "O" will be replaced by the number "0".Any other characters in the parameter string will cause a failure as below. The value of the parameter string must be greater than 998 and no greater than [[login to view URL]][1] - if greater, the module will fail, displaying a fail page in html which I will write and will terminate. Next it will display a descriptive page in html which I shalll write. The next script will ask for a Firstname, Lastname and email address from the user. It should check the email address is valid (ie must have at least one character, then "@", then a domain name). If invalid, it will report failure by giving an html page which I will write and try again, giving an abort function for the [login to view URL] next script will form a filename from the parameter string eg [login to view URL] and will search for the file: <[login to view URL]> If not found, it will put up a fail page which I shall write in html and will [login to view URL] the file is found, it will send an email to the user, giving them a file download link, plus a second download link for another file <[login to view URL]> I will supply the email wording for this. It will then send two emails to my PC giving the user details. I have a script available for this function, it will need about a four line edit? to fit in with the other scripts. That concludes the requirement and the script will terminate.