I think I just coded myself into a corner. I am setting up a page with an image. The image is an imagemap with lots of links. When you click on the link, it opens a post in a colorbox. So far I have managed to get this part working using a combination of the Lightbox Plus and Post Template plugins.
Unfortunately this involves assigning each post to a specific template. The template simply removes the title/image/menu. But this permanently alters the post display. I need to post to still show the full header if it is accessed through the normal menu or from a Google search.
How can I display a post differently based on how it is accessed? OR - how can I insert just the post content into the colorbox window without using a custom page or post template?