Add Multiple insert records to db table using PHP MYSQL and Java Script

Been struggling with this one for a while now. I've got a PHP code that INSERT data into database, I've got Javascript code that create dynamic forms that can be used to INSERT more than one INSERT field. The problem I'm having is inserting multiple form inputs in one query. Please see my code below. Will ready appreciate help!!!

PHP CODE

<?php

$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
  $editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "form1"))
{


   mysql_select_db($database_Localhost, $Localhost);

    if (is_array($_POST["MM_insert"])) {
    $len = count($_POST["MM_insert"]);
 for ($i = 0; $i <= $len-1; $i++) {

  $insertSQL = sprintf("INSERT INTO tJobcardItem (JobcardItemID, JobcardID, `Description`, PrintColour, COL, POS, MethodID, Mesh, Ink, Quantity, Prep, Cost) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)",
                       GetSQLValueString($_POST['JobcardItemID'][$i], "int"),

                       GetSQLValueString($_POST['JobcardID'][$i], "int"),

                       GetSQLValueString($_POST['Description'][$i], "text"),

                       GetSQLValueString($_POST['PrintColour'][$i], "text"),

                       GetSQLValueString($_POST['COL'][$i], "int"),

                       GetSQLValueString($_POST['POS'][$i], "int"),

                       GetSQLValueString($_POST['MethodID'][$i], "int"),

                       GetSQLValueString($_POST['Mesh'][$i], "text"),

                       GetSQLValueString($_POST['Ink'][$i], "text"),

                       GetSQLValueString($_POST['Quantity'][$i], "int"),

                       GetSQLValueString($_POST['Prep'][$i], "text"),

                       GetSQLValueString($_POST['Cost'][$i], "double"));

               $Result1 = mysql_query($insertSQL, $Localhost) or die(mysql_error());
 }}}

?>

JAVACRIPT CODE

<script type="application/javascript">


        function addRow(tableID) {

            var table = document.getElementById(tableID);

            var rowCount = table.rows.length;


            var row = table.insertRow(rowCount);



            var cell1 = row.insertCell(0);
            var element1 = document.createElement("input");
            element1.type = "checkbox";
            cell1.appendChild(element1);

             var cell2 = row.insertCell(1);
            var element2 = document.createElement("input");
            element2.type = "text";
            element2.name ="Description[]";
            element2.size="32";
            cell2.appendChild(element2);

            var cell3 = row.insertCell(2);
            var element3 = document.createElement("input");
            element3.type = "text";
            element3.name ="PrintColour[]";
            element3.size="32";

            cell3.appendChild(element3);

            var cell4 = row.insertCell(3);
            var element4 = document.createElement("input");
            element4.type = "text";
            element4.name ="COL[]";
            element4.size="32";
            cell4.appendChild(element4);

            var cell5 = row.insertCell(4);
            var element5 = document.createElement("input");
            element5.type = "text";
            element5.name ="POS[]";
            element5.size="32";

            cell5.appendChild(element5);

            var cell6 = row.insertCell(5);
            var element6 = document.createElement("input");
            element6.type = "text";
            element6.name ="MethodID[]";
            element6.size="32";
            cell6.appendChild(element6);

         var cell7 = row.insertCell(6);
            var element7 = document.createElement("input");
            element7.type = "text";
            element7.name ="Mesh[]";
            element7.size="32";
            cell7.appendChild(element7);

            var cell8 = row.insertCell(7);
            var element8 = document.createElement("input");
            element8.type = "text";
            element8.name ="Ink[]";
            element8.size="32";

            cell8.appendChild(element8);

            var cell9 = row.insertCell(8);
            var element9 = document.createElement("input");
            element9.type = "text";
            element9.name ="Quantity[]";
            element9.size="32";
            cell9.appendChild(element9);

            var cell10 = row.insertCell(9);
            var element10 = document.createElement("input");
            element10.type = "text";
            element10.name ="Prep[]";
            element10.size="32";

            cell10.appendChild(element10);

            var cell11 = row.insertCell(10);
            var element11 = document.createElement("input");
            element11.type = "text";
            element11.name ="Cost[]";
            element11.size="32";
            cell11.appendChild(element11);

        }




        function deleteRow(tableID) {
            try {
            var table = document.getElementById(tableID);
            var rowCount = table.rows.length;

            for(var i=0; i<rowCount; i++) {
                var row = table.rows[i];
                var chkbox = row.cells[0].childNodes[0];
                if(null != chkbox && true == chkbox.checked) {
                    table.deleteRow(i);
                    rowCount--;
                    i--;
                }

            }
            }catch(e) {
                alert(e);
            }
        }




</script>