JQuery DropDown plugin

I just found a JQuery plugin for DropDown, but I am not following how to use it. It's documentation is also not available.

http://code.goog开发者_开发百科le.com/p/jqueryselectcombo/

Is there any other similar free plugin?

It's documentation can be found inside the .js file. As the example demo page says:

Please see source of js file for information on how to use this plugin.

This is a nice one

jquery.combobox

Stylish Select 0.3

and also jQuery selectbox replacement