Cascade on update statement, not on table definition

Hi,

I saw I can define a table that specifies a ON UPDATE CASCADE for a Foreign Key.

I have a lot of tables with FK�s, and a lot of others with others FK\'s for the firts ones, and so on, and I haven�t
definedthe ON CASCADE clause on the FK�s tables.  
Now I need to update a primary key on the \"mother\" table.

Is there a way to execute a stmt like \'update tbl set id_field=NEW_ID where id_field=OLD_ID on CASCADE\', or something
likethat? Or do I need to redefine my tables, or the constraints? 

Tks
Felipe Nascimento