Creating a tagging system for uploaded images

Can anyone give general strategy advice on building a tagging system?
I'm creating an app where users simply upload pics. I've successfully
established an HABTM relationship bw my 'pic' model and my 'tag' model
and have a table w two foreign keys called 'pics_tags'. Adding new
'tags' updates this table just fine.

However, I'm stuck when it comes to assigning already existing tags to
already existing pics. I can currently click on a pic and view its
associated tags and generate a list of available tags in a select
form. However, I get a slew of errors if I try to submit a tag in the
list. Currently, cake thinks I'm trying to add a new pic instead of
updating my 'pics_tags' table.

Do I need a custom function in my pics_controller to handle updating
my 'pics_tags' table?

Can anyone point me to a tutorial for building a tagging system?

Thanks.
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