@Photowebmax, there’s nothing embarassing about it at all. It was mainly your answer that got me over the line. Seriously, I would have caved in and used Thickbox earlier on if your persistance hadn’t ’inspired’ me to keep looking for a solution. And yes, I’m going to look at using Fancybox from the start the next time too.
Sometimes we(I) noobs can ’earn’ the ire of some of the more experienced coders - but everyone’s got to start somewhere and you shouldn’t have to be a hardcore dev to use this or any CMS. I’ll bet i’m in a similar poition to you, with my skills originating more in graphics, design and print.
I’d love to write a tutorial about this solution so others might find this less frustrating as it seems reasonably common but I think I’ve got way too much on right now (2 more modx projects + my personal site in modx!).
It could be worse, we could be trying to figure out all this in Drupal.