Jquery Plugin: similar to Google Smart Search tips

Imitating a plug-in made by Baidu and Google, if you have used it, Please give more comments. Smart Search prompts "alt =" jquery plug-in: similar to Google Smart Search Prompt "src =" http://simg.sinajs.cn/blog/images/face/001.gif ">

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// Author: iddqd)
// Email: iddqd5376@163.com
// Http://blog.sina.com.cn/iddqd
// Version 1.1

// Note: Smart Search Prompt
// The plug-in must be bound to the input box control.
// The Ajax return value should be:
// <Li> <p> here is the search result </P> <span> Number of Results </span> </LI>
// Added the upper/lower keys and carriage return function.

// Parameter settings:
// Offset_top                   Top offset relative to the bound control
// Offset_left                  Left offset relative to the bound control
// Panel_width                  Width of the displayed search result list
// Posturl                      Ajax path
// Watermark                    Default Value in the input box
// Watermark_color              Default color of the input box
// Watermark_change_color       The color after the input box is changed
// Choose_color                 Move the cursor over the result list to change the color
// Callback                     The name of the selected function. Only one parameter of the function is the value of the input box.
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(Function ($ ){
   Jquery. FN. Extend ({
       Searchhelp: function (OPTs ){
           Opts = jquery. Extend ({
               Offset_top: 0,
               Offset_left: 0,
               Panel_width: $ (this). Width (),
               Posturl :"",