upload image in modal then use it directly in the page

I managed to create a modal form (http://www.chronoengine.com/faqs/2680-how-can-i-show-a-form-in-a-lightbox.html)

It is called upon from another form.. In this modal one can upload an image.

However, this image is to be shown directly in the "main" form, preferably without refreshing the page as there are more things a visitor has to add and edit.

How do I 'tell' the main form to use that image in its view?

Hi pieter,

I think that perhaps you could do this with JavaScript by triggering something on the main page from the lightbox that would cause the main page to update. Just how you'd do that I don't know, I'd go start Googling for clues.

Bob