A esoTalk (http://esotalk.org/) plugin for embading jquery fancybox (http://fancyapps.com/fancybox/) for post attachement.
Just clone this repo into esoTalkRoot/addons/plugins. Then you can activate over the pluginmanager in the administration section of esoTalk:
$> cd esoTalkRoot/addons/plugins
$> git clone https://github.com/Bravehartk2/attachment_lightbox_for_esotalk