ajax乱码有关问题（仿百度搜索页面），在线求解答，大侠们有空速度帮忙

<?php<br />
//require('common.inc.php');<br />
//require('config.inc.php');<br />
mysql_connect('localhost', 'root' ,'123456');<br />
mysql_select_db("hxyjw_20100416");<br />
mysql_query("SET NAMES GBK");//防止数据库交互时乱码<br />
header('Content-Type:text/html;charset=gbk');<br />
<br />
$queryString = $_POST['queryString'] ;<br />
<br />
if(strlen($queryString) >0) {<br />
$sql= "SELECT username FROM phpcms_member WHERE username LIKE '".$queryString."%'  LIMIT 0,15";<br />
echo $sql;<br />
$query = mysql_query($sql);<br />
while ($result = mysql_fetch_array($query))<br />
{<br />
	$value=$result['username'];<br />
	echo '<li onClick="fill(\''.$value.'\');">'.$value.'</li>';<br />
}<br />
<br />
}<br />
?><br />

nbsp;html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br>
<br>
<br>
<meta><br>
<title>Ajax搜索功能</title><br>
<script></script><br>
<script><br />
function lookup(inputString) {<br />
if(inputString.length == 0) {<br />
// Hide the suggestion box.<br />
$('#suggestions').hide();<br />
} else {<br />
$.post("rpc.php", {queryString: ""+inputString+""}, function(data){<br />
if(data.length >0) {<br />
$('#suggestions').show();<br />
$('#autoSuggestionsList').html(data);<br />
}<br />
});<br />
}<br />
} // lookup<br />
function fill(thisValue) {<br />
$('#inputString').val(thisValue);<br />
setTimeout("$('#suggestions').hide();", 200);<br />
}<br />
</script><br>
<style><br />
body {<br />
font-family: Helvetica;<br />
font-size: 11px;<br />
color: #000;<br />
}<br />
h3 {<br />
margin: 0px;<br />
padding: 0px;<br />
}<br />
.suggestionsBox {<br />
position: relative;<br />
left: 30px;<br />
margin: 10px 0px 0px 0px;<br />
width: 200px;<br />
background-color: #212427;<br />
-moz-border-radius: 7px;<br />
-webkit-border-radius: 7px;<br />
border: 2px solid #000;<br />
color: #fff;<br />
}<br />
.suggestionList {<br />
margin: 0px;<br />
padding: 0px;<br />
}<br />
.suggestionList li {<br />
margin: 0px 0px 3px 0px;<br />
padding: 3px;<br />
cursor: pointer; <div class="clear">
                 
              
              
        
            </style>