Floatbox not lightboxing images contained within custom fields

Hi
I've included custom fields, using simple fields http://wordpress.org/extend/plugins/simple-fields/ for my clients site.
These custom fields are repeatable and dynamic, and are used to created a editable image structure for each post.
The thing is, Floatbox plus only recognises posts within the standard post content window, i tested this and it works there, but not on images inserted into the custom fields.

How can I get floatbox plus to recognise images within any field in a post?

Best
Marc

[cybio]

you could try "filter" the content of the custom fields (using the method "change_content" of the floatbox plus object) or you could change the image links directly: http://randomous.com/floatbox/instructions .