I am building in a tabbed series template. When I prepare the description pop-up for a point I am able to insert the URL for the picture in that box. Then when I add the image link URL to a composite picture it loads as a page in another browser tab, not a pop-up. Can it be made into a pop-up with a close button (X) so the user doesn't need to close the tab?

http://arcg.is/1fpdbWA
The only icon I have active right now is the "Agriculture Lands" with a recreation (tree and sign) icon.