This plugin is used for trapping the event of key press, especially useful in jQuery online game design. see jQuery TrapKey Plugi

jCaret is a full-power caret Plugin.

It provides basic selection detection in textbox and textarea giving the following information
The start postion of caret/cursor
The end postion of caret/cursor
The selected text
It enable programmer highlight part of the text in textbox or textarea by:
providing the text directly
providing the start and end position
providing the regular expression for selecting text
It provides the replace() method, which is useful in providing input filter of a textbox or textarea.
See online demostration
jCaret plugi

If you have ever designed a form allowing user entering more than one email? This plugin should help you. It provides the function for adding the add row and delete row dynamicly inside a table, seeTable addRow plugin

This plugin shows you a simple way to display zoomed image.See online Example

This plugin shows you how easy to display an expandable tree. Online demo
Simple Tree-set plugin

This is a jQuery plug-in designed for handling textbox. A "default" message will be displayed in the text box, by pressing any key or focus on the box, the default Text will be disappeared.
Online example can be found in "defaultText Plugin"

This is a jQuery plug-in for displaying clipped image by providing the url, width, height, left and top the image being clipped. Click here for demonstration.

This is a jQuery plug-in displaying a lens and detecting the relative mouse position inside an image. Combining this plug-in with others plugin can format powerful tools, e.g. photo-chopping, zooming, CAD, etc. Detail can be found inhere

This is a jQuery plug-in for adding Matt Glass effect to an image. Examples

This is a simple but hard to find plugin that should be appeared in all the dynamic images or layers for any carefully designed-website. By simply apply the addLoader() function from any jQuery result for images and/or div, there will appear a loading image before loading of file is completed. See examples in here