ขึ้น errror อย่างนี้แก้ยังไงดีคะ Warning: session_start() [function.session-start]: Cannot send session cookie - headers already

<?php
require_once "config/general.php";
$strPage = $_POST["myPage"];
Conn2DB();
//$objConnect = mysql_connect("localhost","root","123456") or die("Error Connect to Database");
//$objDB = mysql_select_db("icservice");
$strSQL = "SELECT * FROM cvhc_main ";
$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
$Num_Rows = mysql_num_rows($objQuery);

$Per_Page = 10;   // Per Page

$Page = $strPage;
if(!$strPage)
{
	$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;
}

$strSQL .=" order  by chvc_main ASC LIMIT $Page_Start , $Per_Page";
$objQuery  = mysql_query($strSQL);
?>
<table width="600" border="1">
  <tr>
    <th width="91"> <div align="center">รหัสรับรถ </div></th>
    <th width="98"> <div align="center">รหัสสาขา </div></th>
    <th width="198"> <div align="center">รหัสรถ </div></th>
    <th width="97"> <div align="center">เวลาที่ยิงรับ </div></th>
    <th width="59"> <div align="center">รหัสลูกค้า </div></th>
    <th width="71"> <div align="center">เวลานัดรับ </div></th>
  </tr>
<?
while($objResult = mysql_fetch_array($objQuery))
{
?>
  <tr>
    <td><div align="center"><?=$objResult["id"];?></div></td>
    <td><?=$objResult["brach_id"];?></td>
    <td><?=$objResult["ahistory_id"];?></td>
    <td><div align="center"><?=$objResult["guard_time"];?></div></td>
    <td align="right"><?=$objResult["user_id"];?></td>
    <td align="right"><?=$objResult["app_time"];?></td>
  </tr>
<?
}
?>
</table>

<br>
Total <?= $Num_Rows;?> Record : <?=$Num_Pages;?> Page :
<?
if($Prev_Page) 
{
	echo " <a href=\"JavaScript:doCallAjax('$Prev_Page')\"><< Back</a> ";
}

for($i=1; $i<=$Num_Pages; $i++){
	if($i != $Page)
	{
		echo "[ <a href=\"JavaScript:doCallAjax('$i')\">$i</a> ]";
	}
	else
	{
		echo "<b> $i </b>";
	}
}
if($Page!=$Num_Pages)
{
	echo " <a href=\"JavaScript:doCallAjax('$Next_Page')\">Next >></a> ";
}
//mysql_close($objConnect);
CloseDB();
?>