INSERT ผลรวมเข้าฐานข้อมูลไม่ได้ครับต้องทำยังไงหรือผมทำอะไรผิดไปช่วยดูให้ทีครับ

<?
include "config.inc.php";
$con2 = mysql_connect($host,$username,$password);
$id_employee= $_GET["id_employee"];
if (!$con2)
  {    die('Could not connect: ' . mysql_error());    }
mysql_select_db($database, $con2);
$result2 = mysql_query("SELECT * FROM employee_details WHERE id_employee=".$id_employee);
$row2 = mysql_fetch_array($result2);
$con3 = mysql_connect($host,$username,$password);
if (!$con3)
  {    die('Could not connect: ' . mysql_error());    }
mysql_select_db($database, $con3);
$result3 = mysql_query("SELECT * FROM employee_salaot");
$row3 = mysql_fetch_array($result3);
?>
<link rel="stylesheet" media="all" type="text/css" href="js/jquerydatepicker/jquery-ui.css" />
		<link rel="stylesheet" media="all" type="text/css" href="js/jquerydatepicker/jquery-ui-timepicker-addon.css" />

		<script type="text/javascript" src="js/jquerydatepicker/jquery-1.10.2.min.js"></script>
		<script type="text/javascript" src="js/jquerydatepicker/jquery-ui.min.js"></script>

		<script type="text/javascript" src="js/jquerydatepicker/jquery-ui-timepicker-addon.js"></script>
		<script type="text/javascript" src="js/jquerydatepicker/jquery-ui-sliderAccess.js"></script>
<script src="SpryAssets/SpryValidationSelect.js" type="text/javascript"></script>
<link href="SpryAssets/SpryValidationSelect.css" rel="stylesheet" type="text/css" />
<form action="employ_insert_salaot.php" method="post" name="form1" id="form1">
  <table width="200" border="1" align="center">
    <tr>
      <td>รหัสพนักงาน</td>
      <td>ชื่อ-นามสกล</td>
      <td>วันที่ทำโอที</td>
      <td>ค่าโอที/ชั่วโมง</td>
      <td>เวลาที่ทำโอที(ชั่วโมง)</td>
      
    </tr>
    <tr>
      <td><?=$row2['id_employee']?></td>
      <td><?=$row2['first_name']?>
        &nbsp;&nbsp;
        <?=$row2['last_name']?></td>
      <td id="startdate"><script type="text/javascript">

$(function(){
	$("#date_ot").datepicker({
		dateFormat: 'yy-mm-dd',
		numberOfMonths: 1,
	});
});

  </script>
        <input type="text" name="date_ot" id="date_ot" value="" /></td>
      <td><?=$row3['sala_ot']?>
      <input name="id_otsala" type="hidden" id="id_otsala" value="<?=$row3['id_otsala']?>" /></td>
      <td><label for="label"></label>
        <input name="hour_ot" type="text" id="hour_ot"></td>
    
    </tr>
  </table>
  <input type="submit" name="button" id="button" value="Submit">
  <input name="id_employee" type="hidden" id="id_employee" value="<?=$row2['id_employee']?>" />
  <?
	  $hour_ot=$_POST[hour_ot];
	  
	  $tot_ot=$row3['sala_ot']*$hour_ot;
	   ?>
</form>
<?
mysql_close($con2);
mysql_close($con3);
?>

<? 
include "config.inc.php";
$con = mysql_connect($host,$username,$password);
if (!$con)
  {     die('Could not connect: ' . mysql_error());    }
mysql_select_db($database, $con);
mysql_query("SET NAMES UTF8");
$id_employee= $_POST["id_employee"];
$date_ot= $_POST["date_ot"]; 
$id_otsala= $_POST["id_otsala"]; 
$hour_ot= $_POST["hour_ot"]; 
$tot_ot= $_POST["tot_ot"]; 

$sql="INSERT INTO employee_totalot(id_otsala,date_ot,id_employee,hour_ot,tot_ot) 
 VALUES('$id_otsala','$date_ot','$id_employee','$hour_ot','$tot_ot')";
 if (!mysql_query($sql,$con))
  {    die('Error: ' . mysql_error());    }
header("Location: employee_detail_list.php"); 
mysql_close($con);
?>