Conversation from innodb engine to myiasm engine

The following error I am getting while converting from innodb engine to myiasm engine please let me know resolution
Cannot delete or update a parent row: a foreign key constraint fails

Hi malakari;

MyISAM does not support foreign keys. If you want to convert your tables to MyISAM, you will need to drop the foreign key constraints first and then do the conversion.

http://dev.mysql.com/doc/refman/5.5/en/alter-table.html

-Scott