Some Links

General Info for Firebird:
http://www.firebirdsql.org/refdocs/langrefupd20.html

General Info for MySQL:
http://dev.mysql.com/doc/refman/5.1/en/index.html

Trigger Info for Firebird:
http://www.firebirdsql.org/refdocs/langrefupd20-create-trigger.html

Trigger Info for MySQL:
http://dev.mysql.com/doc/refman/5.1/en/trigger-syntax.html