Shadowbox works well. If you do not want to add the rel=’lightbox” manually to each image,
install shadowbox plugin, then click on the settings button (next to the activate button), within the settings choose your js library (I use Mootools) then scroll down and make sure that “image links” is set to “true” under “shadowbox automation”, then go to any post. Under the visual editor click the button to add an image. Choose the styles for your thumb (thumnail, medium, large, original size) then above those settings is a button “file URL”, click that so that it links to the large version of the image (this is not selected by default after the 2.7 install!)Check the link to confirm that it chose the path to the correct large image. Save Post. View in browser. All Done.
