[fw-db] MultiCheckBox Populate form, Insert/Update db how to?

Hi,

I have three tables...
1. article
2. tags
3. article2tags".

The "article2tags" stores a a many-to-many relationship (made up of article_id and tag_id).

While creating/editing an article:
Need some direction/help/sample code to achieve...
1. Save the relationship to the article2tags table when creating a new article
2. Populate form with tags selected (check boxes) when editing the article
3. Insert/Update the "article2tags" on updating the article

All help is appreciated.

regards,
-R

P.S. My tables are MyISAM.