Javascript: checking a table cell ID

Hello,

I wrote the following codes to check whether a table cell has a ID 'D1', but it doesnt work. ANyone got a solution?

<script>
function test()
{

var oRow;
var curr_row, curr_cell;

for (curr_row = 0; curr_row < oTable.rows.length; curr_row++)
{
oRow = oTable.rows[curr_row];

for (curr_cell = 0; curr_cell < oRow.cells.length; curr_cell++)
{
if (oRow.cells[curr_cell].ID == "D1")
alert('found');
}
}

}
<script>
<table ID="oTable">
<tr>
<td ID="D1">cell 1</td>
</tr>
</table>

the above problem is solved by using ".id" instead of ".ID".