Plugin features:
Highly configurable
Customizable with CSS styling
Handles scaled images
Keyboard support for moving and resizing the selection
Supports callback functions
Provides API functions for easier integration with other application components
Lightweight — the packed version is less than 8KB
The plugin works in all major browsers, including Firefox 2+, Opera 9.5+, Google Chrome, Safari 3+, and Internet Explorer 6+.
Click and drag on the image to select an area.

Selection Preview

Coordinates
Dimensions
X1:
Width:
Y1:
Height:
X2:
Y2:
Then, to enable selection on an image, wrap it in a jQuery object and call the <code>imgAreaSelect()</code> method:
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For web developers who want to extend/modify the plugin, here's a fully documented version of the source code:
<a href="http://odyniec.net/projects/imgareaselect/jquery.imgareaselect.dev.js">jquery.imgareaselect.dev.js</a>
Dual licensed under the MIT and GPL licenses.
<a href="http://plugins.jquery.com/project/imgAreaSelect">imgAreaSelect on jQuery Plugins</a>
<a href="https://github.com/odyniec/imgareaselect">imgAreaSelect on GitHub</a>