帮忙改一下错,该如何处理

帮忙改一下错
请好心人帮忙改一下错

Warning: chkinput::include(conn/conn.php) [chkinput.include]: failed to open stream: No such file or directory in D:\AppServ\www\xiaoyuan\admin\chkadmin.php on line 15

Warning: chkinput::include() [function.include]: Failed opening 'conn/conn.php' for inclusion (include_path='.;C:\php5\pear') in D:\AppServ\www\xiaoyuan\admin\chkadmin.php on line 15

Warning: mysql_query(): supplied argument is not a valid MySQL-Link resource in D:\AppServ\www\xiaoyuan\admin\chkadmin.php on line 16

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in D:\AppServ\www\xiaoyuan\admin\chkadmin.php on line 17



下面是chkadmin.php的代码
<?php
header ( "Content-type: text/html; charset=gb2312" ); //设置文件编码格式
 class chkinput{
  var $name;
  var $pwd;

  function chkinput($x,$y)
  {
  $this->name=$x;
  $this->pwd=$y;
  }

  function checkinput()
  {
  include("conn/conn.php");
  $sql=mysql_query("select * from tb_admin_user where name='".$this->name."'",$conn);
  $info=mysql_fetch_array($sql);
  if($info==false)
  {
  echo "";
  exit;
  }
  else
  {
  if($info[pwd]=='$pwd'){
  header("location:index.php");
  }
  else
  {
  echo "";
  exit;
  }

  }  
  }
 }


  $obj=new chkinput(trim($_POST[name]),md5(trim($_POST[pwd])));
  $obj->checkinput();

?>



下面是 admin_user.php的代码