nice, many thanks for the solution.
do you know why captcha was needed?
It was for security purposes. Theymos included the captcha to prevent brute-force attempts using multiple IP's which would in a sense negate the wait period that one has when they use a single IP for login attempts. Read this thread for some more details.
Recently someone has taken to using 5000+ IPs to bypass rate-limits and try many passwords. Therefore, it is now required to solve a captcha when logging in. JavaScript is required for this. I know that several forum users like to use NoScript, but I am not aware of any high-quality (ie. not OCR-able) captcha services/libraries which don't require JavaScript. You can maybe enable JS just for the login page, and then disable it again afterward.
There are a few people who use automated bots which need to login. Contact me with a description of your bot, and if it seems reasonable, I will give you a key which will allow you to bypass the captcha.
Let me know if you see any bugs.
And there are a lot of captcha threads that have popped up.
Thank you so much for your reply and the quote from theymos ! I couldn't dream or wish a better reply.
Those kind of "hackers" are such a shame for themselves and a plague for internet...