126002 Peculiar PHP Problem

hi, I have got a PHP and mysql site in which there is a peculiar problem. The records of certain tables of this site is deleted on random dates. I suspect someone who is unhappy with me has put in a routine in the codes to do this :-) The tables affected are always the same but the date during which the table records are deleted is random. I want an expert to study this code and find out which routine is causing this problem and suggest alternatives to solve this problem. You can take a look at the source code and database here :- ftp : [login to view URL] uid : matri pwd : guest the database can be found in this folder under the above ftp : [login to view URL] the table which is always affected is "mainentry"