prettyPhoto is a great jQuery lightbox clone that i often use in projects. Again, a plugin to make it easier. :-)
This plugins search to every image that is inside a link and adds prettyPhoto parameters to the link.
Works for Gallery and single images, make sure to choose for media file instead of media attachment when you place an image.
I recommend to install plugins via your WordPress Dashboard.
For manual installation:
Download mklasen's Photobox Plugin (
http://wordpress.org/extend/plugins/mklasens-photobox/).
To install mklasen's Photobox follow these steps:
- Upload the folder \"mklasens-photobox\" to your WordPress plugin folder (/wp-content/plugins/)
- Activate the plugin through the 'Plugins' menu in WordPress