407825 Quickfix: PHP/MySQL 3

Getting this error on our forum after installing a captcha: Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at abp/forum/[login to view URL]) in /xxx/xxx/forum/[login to view URL] on line 65 Need someone to fix it. 2) Another section running Classifieds script: Members are getting logged out automatically... The coder from SL who worked on it has disappeared after creating these problems while working on other areas. Need someone to go in and fix these. ASAP