问将PHP变量从Button传递给Javascript函数

EN

<script type="text/javascript">
function show_confirm(id)
{
var r=confirm("Are you sure you want to duplicate this record?");
if (r==true)
  {
  window.open ("http://domain.com/process.php?duplicate=id","mywindow");
  }
else
  {
  alert("Record Not Duplicated.");
  }
}
</script>

$query = "SELECT * FROM contacts";
        $result = mysql_query($query);      

        while($row = mysql_fetch_row($result)){

                $id = $row[0];
                $company = $row[3];
                $firstName = $row[4];
                $protection = $row[20];

            echo '<tr>';
            echo '<td width="120" align="middle"><font color="black"><b>' . $company . '</b></font></td>';
            echo '<td width="120" align="middle"><font color="black"><b>' . $firstName . '</b></font></td>';

            echo "<td width='120' align='middle'><a style='text-decoration: none;' href='http://domain.com/index.php?id=14&edit=" . $id . "'><span style='font-family:Helvetica; color:black;'>Edit</span></a>";
            echo "<td width='120' align='middle'><input type='button' onclick='show_confirm($id)' value='Duplicate' />";

            echo "</td>";               
            echo '</tr>';


        }
        ?>

echo "<td width='120' align='middle'><input type='button' onclick='show_confirm($id)' value='Duplicate' />";