For each single post page on my WP, I have a large images that, when clicked, link to an attachment.php page where you can click through to view all images in the gallery (by clicking next).
What I need is, when an image is clicked in a post, for a lightbox gallery to pop up where one can click through and view all the images in the gallery.
I do not want a gallery style layout in my posts (thumbnail grid), because I have text and links interspersed throughout each post.