Encoded URL login and website interaction

Dear All,

would you please advise me me upon a cURL/PHP login script? I have
seen quite a few similar posts in many areas of the Internet but I
could not find an answer. Possibly, due to my unacceptable ignorance
in the arts of HTTP/PHP so please assume only very basic knowledge on
my part. Anyway, if you believe this post is repetitive I would be
obliged for references.

My ultimate goal is to prepare a script that would renew my loans from
the library. Some of the books are week only loans but library web
page provides a way of renewing. The library still sends a recall
message if somebody else requests a book. I simply don't want to renew
the books every week.

I looked at some of your script and modified it so that eventually
came out with a version that I attach with this e-mail.

My main concern is that the output is identical if I give wrong
credentials. How can I move from this point? How do I deal with
session id? The location of the login script is also encoded and
changes every time enter the website. Do I have to take this into
account?

I also attach the headers that I capture when I login. Note the random
characters in URL. I would greatly appreciate any comments, hints or
references.

Best wishes,
Robert

_______________________________________________
http://cool.haxx.se/cgi-bin/mailman/listinfo/curl-and-php