(PHP 4 >= 4.0.2, PHP 5)
fdf_set_javascript_action — Sets an javascript action of a field
$fdf_document
   , string $fieldname
   , int $trigger
   , string $script
   )Sets a javascript action for the given field.
fdf_document
     The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
fieldname
     Name of the FDF field, as a string.
trigger
     
script
     
   Returns TRUE on success or FALSE on failure.