DB_FormBuilder

Hi, I have some problems to understand how to realize a working logic for related tables in situations like the following sql schema: CREATE TABLE measure (

    measure_id int(11) NOT NULL auto_increment,
    measuretype_ID_ID int(11) NOT NULL,
    client_ID int(11) NOT NULL,
    title VARCHAR(96) NOT NULL default '',
    info TEXT,
    date_lastedit datetime NOT NULL,
    date_created datetime NOT NULL,
    PRIMARY KEY (measure_id),

KEY client_ID (client_ID), KEY measuretype_ID (measuretype_ID), ) TYPE=MyISAM; CREATE TABLE photos (

    photo_id int(11) NOT NULL auto_increment,
    file_ID int(11) NOT NULL,
    measure_ID int(11) NOT NULL,
    PRIMARY KEY (photo_id),
    KEY file_ID (file_ID),

KEY measure_ID (measure_ID) ) TYPE=MyISAM; CREATE TABLE file ( file_id int(11) NOT NULL auto_increment, title varchar(64) NOT NULL default '', mime varchar(12) default NULL, size varchar(32) default NULL, width varchar(6) default NULL, height varchar(6) default NULL, date_lastedit datetime NOT NULL, PRIMARY KEY (file_id) ) TYPE=MyISAM; The flow is so that each item in table "measure" will have a file form field where I want to upload a file and then insert the file data into the "file" table. Then I use the "photos" table for the relation between the "measure" and "file" table. The problem is how to implement this in my FormBuilder Measure Class when I create the form. Is it possible for the FormBuilder to recognize such a relation from within the Measure Class, or do I have to create an instance of the File Class in the Measure Class. Sorry for this confusion, but I am a bit stuck here. Thanks, David Thunman