คลิกบันทึกแล้วไม่ไปครับ

<?
    include("config.php");
    
session_start();
if(!session_is_registered(user_name)) {
            echo"<script>alert('กรุณาเข้าสู่ระบบ'); window.location='?p=login';</script>";  

  } else{  
  
             if($_SESSION[status] != "u2"){
                    
            echo"<script>alert('สถานะของคุณไม่มีสิทธิ์ใช้งานในหน้านี้'); window.location='index.php';</script>";  
                    
             }
                
}

    if($_POST[ok])
    {
    $Emp_no=$_POST[Emp_no];
    $salary=$_POST[salary];
    $sql="update emp set salary='$salary'
             where Emp_no='$Emp_no' ";
    mysql_db_query($dbname,$sql);
    //echo $sql;
    echo"<script>alert('[บันทึกข้อมูลแล้ว]'); window.location='?p=viewemp02';</script>";
    }
?>
<meta http-equiv="Content-Type" content="text/html; charset=windows-874" />
<style type="text/css">
<!--
.style4 {font-size: 9pt; font-weight: bold; }
-->
</style>
<div align="center">บันทึกเงินเดือน<br />
<br>
<?
            $sql= "select * from emp  ORDER by Emp_no asc ";
            //$sql= "select emp_no,emp_name,salary,job,dept_name  from emp inner join dept on emp.dept_no = dept.dept_no";
            
?>
      <table width="793" border="0" cellspacing="0" cellpadding="3">
      <?
          $result = mysql_query($sql) ;
        
   $Num_Rows = mysql_num_rows($result);
    $Per_Page = 5;  
    $Page = $_GET["Page"];
    if(!$_GET["Page"])
    {
        $Page=1;
    }

    $Prev_Page = $Page-1;
    $Next_Page = $Page+1;

    $Page_Start = (($Per_Page*$Page)-$Per_Page);
    if($Num_Rows<=$Per_Page)
    {
        $Num_Pages =1;  
    }
        else if(($Num_Rows % $Per_Page)==0)
    {
            $Num_Pages =($Num_Rows/$Per_Page) ;
    }
    else
    {
        $Num_Pages =($Num_Rows/$Per_Page)+1;
        $Num_Pages = (int)$Num_Pages;
    }

    $sql .="LIMIT $Page_Start , $Per_Page";
    $result  = mysql_query($sql);
   //จบ
        while($row=mysql_fetch_array($result) )
        {
            $sql2 ="select * from dept where dept_no='".$row[dept_no]."'";
            $result2=mysql_query($sql2);
            $row2=mysql_fetch_array($result2);
            $deptname=$row2[dept_no]." - ".$row2[dept_name];
      ?>

        <tr>
          <td width="144" height="32" align="left" valign="top" bgcolor="#99FFFF"><div align="center"><span class="style4">รหัสพนักงาน</span></div></td>
          <td width="187" align="left" valign="top" bgcolor="#99FFFF"><div align="center"><span class="style4">ชื่อ-สกุล</span></div></td>
          <td width="144" align="left" valign="top" bgcolor="#99FFFF"><div align="center"><span class="style4">ตำแหน่ง</span></div></td>
          <td width="156" align="left" valign="top" bgcolor="#99FFFF"><div align="center"><span class="style4">แผนก</span></div></td>
          <td width="132" align="left" valign="top" bgcolor="#99FFFF"><div align="center"><span class="style4">เงินเดือน</span></div></td>
        </tr>
        <tr>
          <td align="left" valign="top" bgcolor="#99FFFF"><input type="text" name="Emp_no" id="Emp_no" value="<?=$row[Emp_no] ?>" disabled="disabled" /></td>
          <td align="left" valign="top" bgcolor="#99FFFF"><input type="text" name="Emp_name" id="Emp_name" value="<?=$row[Emp_name] ?>" disabled="disabled" /></td>
          <td align="left" valign="top" bgcolor="#99FFFF"><input type="text" name="job" id="job"  value="<?=$row[job] ?>" disabled="disabled" /></td>
          <td align="left" valign="top" bgcolor="#99FFFF"><input type="text" name="dept_name" id="dept_name" value="<?=$row2[dept_name] ?>" disabled="disabled"/></td>
          <td align="left" valign="top" bgcolor="#99FFFF">
            <div align="center">
              <input type="text" name="salary"  id="salary" value="<?=$row[salary] ?>" size="15" />
            </div></td>
        </tr>      
        <?
        }        
        ?>
         <tr>
          <td colspan="5" align="left" valign="top" bgcolor="#333333"><div align="center">
            <label></label>
            <label>
            <input type="submit" name="ok" id="ok" value="บันทึก">
            </label>
          </div></td>
        </tr>
      </table>
  <p>จำนวนข้อมูล
        <?= $Num_Rows;?>
        ระเบียน :
        <?=$Num_Pages;?>
        หน้า :
        <?
    if($Prev_Page)
    {
        echo " <a href='$_SERVER[SCRIPT_NAME]?p=incentive04&Page=$Prev_Page'><< Back</a> ";
    }
    
    for($i=1; $i<=$Num_Pages; $i++){
        if($i != $Page)
        {
            echo "[ <a href='$_SERVER[SCRIPT_NAME]?p=incentive04&Page=$i'>$i</a> ]";
        }
        else
        {
            echo "<b> $i </b>";
        }
    }
    if($Page!=$Num_Pages)
    {
        echo " <a href ='$_SERVER[SCRIPT_NAME]?p=incentive04&Page=$Next_Page'>Next>></a> ";
    }
?>
    <br>
        </p>
</div>