Jcrop Image cropping
Jcrop is the quick and easy way to add image cropping functionality to your web application. It combines the ease-of-use of a typical jQuery plugin with a powerful cross-platform DHTML cropping engine that is faithful to familiar desktop graphics applications.
jQuery jCrop with Event Handler
This example ties several form values together with a simple event handler. The form values are updated as the selection is changed, thanks to Jcrop's onChange event handler.