ช่วยแก้โค้ดให้หน่อย ฮะ code update ทำไงไม่รู้มันบ่อัพเดท

<?
include('db_connect.php');
include('header.php');
include('left.php');
extract($_GET);
$u_name = $flag;

?>
<link href="style.css" rel="stylesheet" type="text/css" />
               <td width="421" rowspan="2"><div align="center">
                 <table width="655" border="0" align="center" cellpadding="0" cellspacing="5" bordercolor="#FFFFAA">
                 
<tr>

   <?
$query = "Select * from user_info where u_name = '$u_name'";
$result = mysql_query($query);
while($result_row = mysql_fetch_row($result))
{ 
?>
				       <td width="645" height="131"><div id="container">
                       <p id="headerp">User Information Update </p>
                       <p></p>
                       <form id="add_user" name="add_user" method="post" action="u_add_info.php"  class="other">
                         <table width="379" border="0" align="center" cellpadding="5">
                           <tr>
                             <td width="116" class="other">User name:</td>
                             <td width="237" class="c_l_text"><input name="u_name" type="text" id="u_name" value="<? echo $result_row[0]; ?>" /></td>
                           </tr>
                           <tr>
                             <td class="other">Password:</td>
                             <td class="c_l_text"><input name="pws" type="password" id="pws" onkeypress="check_number()" value="<? echo $result_row[1]; ?>" /></td>
                           </tr>
                           <tr>
                             <td class="other">Status:</td>
                             <td class="c_l_text"><input name="status" type="text" id="status" onkeypress="check_number()" value="<? echo $result_row[2]; ?>"/></td>
                           </tr>
                           <tr>
                             <td class="other"><label>Staff ID:</label></td>
                             <td class="c_l_text"><input name="st_id" type="text" id="st_id" onkeypress="check_number()" value="<? echo $result_row[3]; ?>"/></td>
                           </tr>
                           <tr>
                             <td>&nbsp;</td>
                             <td><input type="submit" name="Submit" value="Enter" onclick="chksumit()"/>
                             <input type="reset" name="Submit2" value="Cancel" /></td>
                           </tr>
                         </table>
                         <p>&nbsp;</p>
                         </form>
                       </div>
                    </td>
                   </tr>
				    <?
				   }
				   ?>
                 </table>
              </div></td>
               <div align="center">
              
            </div>
            <tr>
              <td>&nbsp;</td>
              <td>&nbsp;</td>
            </tr>
          </table></td>
        </tr>
      </table></td>
    </tr>
    
  <?
	
	include('footer.php');
	
	?>
	<script>
function check_number() {
e_k=event.keyCode
if (((e_k < 48) || (e_k > 57)) && e_k != 46 && e_k != 10) {
//if (e_k != 13 && (e_k < 48) || (e_k > 57) || e_k == ) {
event.returnValue = false;
alert("Please insert number only");
}
}
function chksumit()
{
	if(document.add_user.u_name.value=="")
	{	
	event.returnValue = false;
	alert("Please insert name");
		document.add_user.u_name.focus();
	}else
		if(document.add_user.pws.value=="")
		{	
		event.returnValue = false;
		alert("Please insert address");
			document.add_user.pws.focus();
			}else
		if(document.add_user.cmd.value=="")
		{	
		event.returnValue = false;
		alert("Please insert mobile number");
			document.add_user.cmd.focus();
			
		}else
		
		if(document.add_user.st_id.value=="")
		{	
		event.returnValue = false;
		alert("Please insert mobile number");
			document.add_user.st_id.focus();
			
		}else
		
		
			{
				document.add_user.submit();
			}
}
</script>

<?php
include('db_connect.php');
$u_name = $_POST['u_name'];

$pws = $_POST['pws'];

$status = $_POST['status'];

$st_id = $_POST['st_id'];



$sql = "update user_info set u_name = '$u_name' , pws = '$pws' , status = '$status' , 	st_id = '$st_id'	WHERE u_name = '$u_name' ;";
mysql_query($sql);
?>
<meta http-equiv='refresh' content='5;URL=m_user.php' />

               <style type="text/css">
<!--
.style1 {font-size: 36px}
body {
	background-color: #01111B;
}
.style2 {font-size: 36px; color: #FFFFFF; }
-->
               </style>
               <td width="421" rowspan="2" bgcolor="#01111B"><div align="center">
                 <table width="611" border="0" align="center" cellpadding="0" cellspacing="5" bordercolor="#FFFFAA">
                   <tr>
                     <td width="601" height="131"><div id="container">
                       <p align="center" class="style2" id="headerp">Update New Information was Successfully </p>
                       <p align="center" class="c_l_text"><img src="images/wait.gif" width="16" height="16" /></p>

                       <table width="389" border="0" align="center" cellpadding="5">
                         <tr>
                           <td width="171" class="style2">User name</td>
                           <td width="192" class="style2"><? echo "$u_name"; ?></td>
                         </tr>
                         <tr>
                           <td class="style2">Password</td>
                           <td class="style2"><? echo "$pws"; ?></td>
                         </tr>
                         <tr>
                           <td class="style2">Status</td>
                           <td class="style2"><? echo "$status"; ?></td>
                         </tr>
                         <tr>
                           <td class="style2">Staff ID </td>
                           <td class="style2"><? echo "$st_id"; ?></td>
                         </tr>
                       </table>
                       <p>d<span class="style2">Delete after code finish </span></p>
                       <p><br />
                       </p>
                       </div>
                     <p class="style1">&nbsp;</p>
                       <p>&nbsp; </p>
                     <p>&nbsp;</p>                     </td>
                   </tr>
                 </table>
              </div></td>
               <div align="center">
              
            </div>
            <tr>
              <td>&nbsp;</td>
              <td>&nbsp;</td>
            </tr>
          </table></td>
        </tr>
      </table></td>
    </tr>