Password Encryption Issues

Hello all, This is kinda hard to explain, but I am having a problem with pass encryption/decryption stuff. I had a section of my website protected by a cookie-based log in that authenticates from a database (mySQL) of user/pass combinations... anyway, I am moving that website from one server to another... The username and password are exactly the same in the new DB as it was in the old one... and of course, I have them encrypted... but it wont authenticate because the sql query is spitting out a different encrypted pass from the login form so when I do the following query: SELECT id FROM table WHERE ((username = '$username') AND (password = PASSWORD('$password')) the encrypted password there is different than the enctypted pass in the DB. Any help with this would be appreciated! thanks! -lindsey