I have followed the advice in another thread to get the following working:

When I click and image a lightbox opens and a form displays correcctly. The problem is that once the form is completed and the submit button pressed the next page also loads inside the lightbox but I would like the lightbox to close on submission of the form so that the thank you page diaplays outside the lightbox.

Is this possible?

The code I used was

Hello,

It requires modification template of "Chrono Forms" extension. We can help to do it, if you provide link to page where plugin is used and temporary access to your Joomla! backend by email that we can edit "Chrono Forms" files.

Regards,
ARI Soft

Thanks for the reply. I'm still busy developing the site so would need to make the chnages on my local site. Are you able to let me know what to do so that I don't end up over writing the changes?

We can say what files necessary to change because we can't see what is loaded into the lightbox on your site. We suppose it requires to add target="_parent" to <FORM> tag for "Chrono Forms" extension.

Regards,
ARI Soft

Thank you very much. Your replacement code worked perfectly.