Re: moreneat image gallery popup
The secret to finding the template is;
Look at the page URL you are modifying, then look for a tpl which has the same name as the PHP file (obviousley with a .tpl extension)
The obvioius exceptions to this are the templates for things like e-mails and unusually integrated components.
For example, the image popup window uses the tiki-browse_image.tpl template - within the template which acts when the $_REQUEST'popup' is set (in smarty it will be termed {$popup}).
Get the idea?