Enable Text box in a HTML Table

Dear all Gurus,

I'm stucked with below logic. Wanna get your advice to find out where I went wrong.Please help....

Below is my Coding .
A dynamic HTML table is generated with text boxes (in Dissable mode) with EDIT & DELETE buttons . When user clicks on Edit button, particular row should be enable to edit the values generated.

But Unfortunately in my coding, always the fist row only gets enabled.

<script type="text/javascript">
function m(id){
document.getElementById('Record_id').disabled=false;
document.getElementById('file_number').disabled=false;
return false;
}

</script>

while ($rw = mysql_fetch_array($query1)) {
$k = $rw['Record_id'];
echo '<tr>';
echo'<form name = "t_data">';
echo '<td>'.'<input type="text" id="Record_id" name="Record_id"value="'.$rw['Record_id'].'" disabled="true" size ="5"/>'.'</td>';
echo '<td>'.'<input type="text" id="file_number" name="file_number" value="'.$rw['file_number'].'" disabled="true" size = "9"/>'.'</td>';
echo '</tr>';
 
echo '<tr>';
echo' <td>';
echo'<form action="dlt_grid.php" method = "GET">';
echo'<input type="submit" value="Delete">';
echo'<input type="hidden" name="hf" value="'.$k.'">';
echo'</form> ';
echo'</td>';
                    
echo' <td>';
echo'<input type="submit" id="'.$k.'" value="Edit" onclick = "return m(this.id)">';
echo'<input type="hidden" name="hf" value="'.$k.'">';
echo'</td>';
echo '</tr>';
echo'</form>';

PHP:

 

from my point if view it will work perfect....