การใช้ checkbox เลือกข้อมูลแล้วส่งไปเซฟแบบมี submit อันเดียวต้องทำไงครับ

<?
	require("connect.inc.php");
	$sql = "SELECT * FROM product ORDER BY pro_id ASC ";
	$query = mysql_query($sql) or die ("Error Query [".$sql."]");
	echo"<table border=\"0\"  cellspacing=\"1\" cellpadding=\"1\"><tr>";	
	$intRows = 0;
	while($result = mysql_fetch_array($query))
	{
	$intRows++;
	echo "<td>";									
	?>
	  <table width="91" border="0" cellspacing="4" cellpadding="0">
        <tr>
          <td><div align="center"><!--<a href="./admin/images/<?=$resqult["pro_pic"];?>" target="_blank"><img src="./admin/images/<?=$result["pro_pic"];?>" width="200" height="150" border="0"></a>-->
          <img src="./admin/images/<?=$result["pro_pic"];?>" width="200" height="150" border="0">
          </div></td>
        </tr>
        <tr>
          <td><div align="center"><?=$result["pro_name"];?>
              <form id="form1" method="post" action="test_item.php">                
                  <input type="checkbox" name="chkitem[]" value="<? echo $result['pro_name']; ?>" />
                  <span class="style1">จอง <strong>:</strong> จำนวน</span> 
                <input type="text" name="amount[]" value="" size="4" />
                <input name="btnSubmit" type="submit" value="Submit">
              </form>
          </div></td>
        </tr>
      </table>
<?
		echo"</td>";
		if(($intRows)%3==0)
		{
		echo"</tr>";
		}
		else
		{
		echo "<td>";
		}	
	}
	echo"</tr></table>";
?>
<?
	mysql_close($connect) or die (mysql_error);
	?>