Need advice on building website registration system!

Hi all! I'm trying to build a registration system for a community site that I'm building, and was wondering if people could give me advice or tell me about problems they've been having?? I'm planning to let people register with a username and password (encrypted), and then make them login with that, and thus putting a cookie on their machine. If the cookie is detected the next time, they don't have to login, but if it isn, then they do. Sounds pretty simple?? Any advice? TIA! sunny ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie