ช่วยดูโค้ดให้หน่อยจ้า ขึ้น error mysql_query() expects parameter 1 to be string, resource given in

<?php
include('connect.php'); 
	$name = $_REQUEST["name"];
	$add = $_REQUEST["add"];
	$tel = $_REQUEST["tel"];
	$user = $_REQUEST["user"];
	$pass = $_REQUEST["pass"];

	$sql = "INSERT INTO costomer(c_name, c_add, c_tel, c_user, c_pass)
			 VALUES('$name', '$add', '$tel', '$user', '$pass')";

	$result = mysql_query($conn, $sql) or die ("Error in query: $sql " . mysql_error());  *** บรรทัดที่มีปัญหา

	

	mysqli_close($conn);

	
	if($result){
	echo "<script type='text/javascript'>";
	echo "alert('Register Succesfuly');";
	echo "window.location = 'register.php'; ";
	echo "</script>";
	}
	else{
	echo "<script type='text/javascript'>";
	echo "alert('Error back to register again');";
	echo "</script>";
}
?>

   
<?php
    header("Content-Type: text/html; charset=UTF-8");
      
    $host="localhost";
    $user="root";
    $pass="";
    $dbname="member";
  
    $conn=mysql_connect($host,$user,$pass) or die("ไม่สามารถเชื่อมต่อฐานข้อมูลได้");
    mysql_select_db($dbname,$conn); 
    mysql_query("SET NAMES utf8"); 
  
?>

<form id="formRegister" name="formRegister" method="post" action="registersave.php">
  <p><br>

  </p>
  <table width="550" border="0" align="center" cellpadding="0" cellspacing="0">
    
    <tr>
      <td align="right" bgcolor="#FFCCCC">&nbsp;</td>
      <td bgcolor="#FFCCCC">&nbsp;</td>
    </tr>
    <tr>
      <td width="117" align="right" bgcolor="#FFCCCC">ชื่อนามสกุล:
    </td>
      <td width="583" bgcolor="#FFCCCC"><input name="name" type="text" id="name" size="30" placeholder="ภาษาไทยเท่านั้น"  required="required"/></td>
    </tr>
    <tr>
      <td align="right" bgcolor="#FFCCCC">&nbsp;</td>
      <td bgcolor="#FFCCCC">&nbsp;</td>
    </tr>
    <tr>
      <td align="right" bgcolor="#FFCCCC">ที่อยู่
      <label> :</label></td>
      <td bgcolor="#FFCCCC"><input name="add" type="text" id="add" size="30" placeholder="ภาษาไทยเท่านั้น"  required="required"/></td>
    </tr>
    <tr>
      <td align="right" bgcolor="#FFCCCC">&nbsp;</td>
      <td bgcolor="#FFCCCC">&nbsp;</td>
    </tr>
    <tr>
      <td align="right" bgcolor="#FFCCCC">เบอร์โทรศัพท์:</td>
      <td bgcolor="#FFCCCC"><input type="text" name="tel" id="tel" placeholder="ตัวเลขเท่านั้น"  required="required"/></td>
    </tr>
    <tr>
      <td align="right" bgcolor="#FFCCCC">&nbsp;</td>
      <td bgcolor="#FFCCCC">&nbsp;</td>
    </tr>
    <tr>
      <td align="right" bgcolor="#FFCCCC">User name :
  <label> </label></td>
      <td bgcolor="#FFCCCC"><input type="text" name="user" id="user" placeholder="ตัวเลขหรือภาษาอังกฤษเท่านั้น" required="required"/></td>
    </tr>
    <tr>
      <td align="right" bgcolor="#FFCCCC">&nbsp;</td>
      <td bgcolor="#FFCCCC">&nbsp;</td>
    </tr>
    <tr>
      <td align="right" bgcolor="#FFCCCC">Password : </td>
      <td bgcolor="#FFCCCC"><input name="pass" type="Password" id="pass" size="30" placeholder="ตัวเลขหรือภาษาอังกฤษ"  required="required"/></td>
    </tr>
    <tr>
      <td bgcolor="#FFCCCC">&nbsp;</td>
      <td bgcolor="#FFCCCC">&nbsp;</td>
    </tr>
    <tr>
      <td bgcolor="#FFCCCC">&nbsp;</td>
      <td bgcolor="#FFCCCC"> &nbsp;
      &nbsp; <input type="reset" name="Reset" id="button" value="Reset" />        
      <input type="submit" name="Register" id="Register" value="register" /></td>
    </tr>
    <tr>
      <td bgcolor="#FFCCCC">&nbsp;</td>
      <td bgcolor="#FFCCCC">&nbsp;</td>
    </tr>
  </table>
  <p><br />
   
  </p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>