ajax乱码有关问题

ajax乱码问题
参考一个ajax分页的代码，由于要连接sql server2000，把原代码的utf8改为gb2312，结果点击上一页下一页出现乱码，数据库已经默认是gb2312_chinese_ci了
代码如下：

php代码：

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><title>PHP+ajax分页演示</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"/><script language="javascript" src="ajaxpage.js"></script><div id="result"><?php$terry=mysql_connect("localhost","root","mindy")or die("连接数据库失败:".mysql_error());mysql_select_db("page",$terry);mysql_query("set NAMES 'gb2312'");$result=mysql_query("select * from tb_user");$total=mysql_num_rows($result) or die(mysql_error());$page=isset($_GET['page'])?intval($_GET['page']):1;$page_size=4;$url='index.php';$pagenum=ceil($total/$page_size);$page=min($pagenum,$page);$prepage=$page-1;$nextpage=($page==$pagenum?0:$page+1);$pageset=($page-1)*$page_size;$pagenav='';$pagenav.="显示第<font color='red'>".($total?($pageset+1):0)."-".min($pageset+5,$total)."</font>记录 共<b><font color='yellow'>".$total."</font></b>条记录 现在是第 <b><font color='blue'>".$page."</font></b> 页 ";if($page<=1)$pagenav.="<a style=cursor:not-allowed;>首页</a> ";else$pagenav.="<a onclick=javascript:dopage('result','$url?page=1') style=cursor:pointer;>首页</a> ";if($prepage)$pagenav.="<a onclick=javascript:dopage('result','$url?page=$prepage') style=cursor:pointer;>上一页</a> ";else$pagenav.="<a style=cursor:not-allowed;>上一页</a> ";if($nextpage)$pagenav.="<a onclick=javascript:dopage('result','$url?page=$nextpage') style=cursor:pointer;>下一页</a> ";else$pagenav.="<a style=cursor:not-allowed;>下一页</a> ";if($pagenum)$pagenav.="<a onclick=javascript:dopage('result','$url?page=$pagenum') style=cursor:pointer;>尾页</a> ";else$pagenav.="<a style=cursor:not-allowed;>尾页</a> ";$pagenav.="共".$pagenum."页";if($page>$pagenum){    echo "error:没有此页".$page;    exit();}?><table align="center" border="2" width="300">  <tr bgcolor="#cccccc" align="center">    <td>用户名</td>    <td>用户密码</td>  </tr><?php$info=mysql_query("select * from tb_user order by id desc limit $pageset,$page_size");while($array=mysql_fetch_array($info)){?>  <tr align="center">    <td><?php echo $array['id'];?></td>    <td><?php echo $array['username'];?></td>  </tr><?php    }?></table><?phpecho "<p align=center>$pagenav</p>";?></div>

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JScript code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->var http_request=false;  function send_request(url){//初始化，指定处理函数，发送请求的函数    http_request=false;    //开始初始化XMLHttpRequest对象    if(window.XMLHttpRequest){//Mozilla浏览器     http_request=new XMLHttpRequest();     if(http_request.overrideMimeType){//设置MIME类别       http_request.overrideMimeType("text/xml");     }    }    else if(window.ActiveXObject){//IE浏览器     try{      http_request=new ActiveXObject("Msxml2.XMLHttp");     }catch(e){      try{      http_request=new ActiveXobject("Microsoft.XMLHttp");      }catch(e){}     }    }    if(!http_request){//异常，创建对象实例失败     window.alert("创建XMLHttp对象失败！");     return false;    }    http_request.onreadystatechange=processrequest;    //确定发送请求方式，URL，及是否同步执行下段代码    http_request.open("GET",url,true);    http_request.send(null);  }  //处理返回信息的函数  function processrequest(){   if(http_request.readyState==4){//判断对象状态     if(http_request.status==200){//信息已成功返回，开始处理信息      document.getElementById(reobj).innerHTML=http_request.responseText;     }     else{//页面不正常      alert("您所请求的页面不正常！");     }   }  }  function dopage(obj,url){   document.getElementById(obj).innerHTML="正在读取数据...";   reobj = obj;   send_request(url);   }<div class="clear"></div>

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