jQuery Auto完成问题

Hi guys i am encountering jquery auto complete problem. Actually, in the example given by developers is working fine but once i am trying to implement into my system it is not working;

<script type='text/javascript' src='scripts/jquery.autocomplete.js'></script></code>

<link rel="stylesheet" type="text/css" href="scripts/jquery.autocomplete.css" />

<script type="text/javascript">

$().ready(function() {

    jQuery("#coursex").autocomplete("get_course_list.php", {
        width: 260,
        matchContains: true,
        selectFirst: false
    });

});

</script>
<form autocomplete="off">
        <p>
            Course Namexx <label>:</label>

            <input type="text" name="course" id="coursex" />

            <!--input type="button" value="Get Value" /-->
        </p>

        <input type="submit" value="Submit" />
</form>

The problem is that I am not getting any javascript error in firebug and all the files are included. ajax-autocomplete project. you may download from the net.

Any suggestions how to debug, how to solve or any other product without jquery only ajax and css.

Hiya see demo here please: http://jsfiddle.net/Xzy9T/

please include Jquery ui (like in example) as well & Please make sure that the src of you you javascripts are correct or you can find one online and add the reference.

HTML

   <p>

        Course Namexx <label>:</label>

        <input type="text" name="course" id="coursex" />

        <!--input type="button" value="Get Value" /-->

    </p>

    <input type="submit" value="Submit" />
​

Jquery

$( "#coursex" ).autocomplete({
    source: function( req, resp ) {
        $.post( "/echo/json/", {
            json: '["1", "2", "3", "4", "5"]',
            delay: 1
        }, function(data) {
            resp( data );
        }, "JSON" );
    }
});
​