ขอรบกวน JavaScript คำนวนราคาแล้วส่งค่าไปtextboxชื่อซ้ำกัน อยากให้ส่งค่าไปtextboxที่วนมาใหม่

<script language="javascript">
function bind(objSelect){
	  document.getElementById("count").value = 1;
	  document.getElementById("sum").value = objSelect.options[objSelect.selectedIndex].value;
}

function f_calculate(obj){
	 objSelect = document.getElementById('select')
	 var val = objSelect.options[objSelect.selectedIndex].value;
	 document.getElementById("sum").value = obj.value * val;
	 
}
</script>

<form id="form2" name="form2" method="post" action="">
   
   <?
	include('config.inc.php');
	$strSQL = "SELECT Order_Pic FROM picture WHERE picture.C_ID = '".$_SESSION['UserID']."' ";
	$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
	echo"<table border=\"0\"  cellspacing=\"1\" cellpadding=\"1\"><tr>";	
	$intRows = 0;
	
	while($objResult = mysql_fetch_array($objQuery))
	{

	$intRows++; 
	
	echo "<td>";									
	?>
    
	  <table width="91" border="1" cellspacing="0" cellpadding="0">
        <tr>
          <td>
            <div align="left"><a href="Pic/<?=$objResult["Order_Pic"];?>" target="_blank"><img src="Pic/<?=$objResult["Order_Pic"];?>" width="100" height="100" border="0" /></a>
              <table width="200" border="1">
                <tr>
                  <td>
                    <select name="select" id = "select" OnChange="bind(this)" >
                      <?
$str = "SELECT * FROM product";
$obj = mysql_query($str) or die ("Error Query [".$str."]");
while($objRe = mysql_fetch_array($obj))
{                       
?>
                   -  <option value="<?=$objRe["Pro_Price"];?>"><?=$objRe["Pro_Name"];?> </option>
                      
  <?
}
?>                       
                    </select>
                  
                  <td width="9"><input name="count" type="text" id="count" value="จำนวนรูป" onkeyup="f_calculate(this.value)" size="5"/></td>
                  <td width="9"><input name="sum" type="text" id="sum" value="ราคา" size="5" readonly /></td>
                </tr>
              </table>
              </div></td>
        </tr>
      </table>
      <?
		echo"</td>";
		if(($intRows)%2==0)
		{
		echo"</tr>";
		
		}
		else
		{
		echo "<td>";
		}	
	}
	echo"</tr></table>";
	
	?>