website -> log in -> download file ??

Problem...

Program should download file from http://www.hattrick.org/, it should log in whit my username/password and download file from there..i know somehow how to download websites.. but this one needs login first and stay logged when getting file from there..

Any ideas how to log in there and download file?

Depends on the site. Some websites will set a cookie on the computer and will ask for that cookie to keep track of you or I think some keep track of IPs and some keep track of session IDs. So what you do is using HTTP protocol you login to your site. If it is using a session ID just send the session ID back when you request the file to download. If it is by IP then the server will keep track for you and send you the file. If by cookie then you must send the cookie back when you request the file.