:eq jquery
element count
HTML
# Jquery EQ
<table border="1">
<tr>
<td class='a'>TD #0</td>
<td class='a'>TD #1</td>
<td class='aa'>TD #2</td>
</tr>
<tr>
<td class='aa'>TD #3</td>
<td class='a'>TD #4</td>
<td class='a'>TD #5</td>
</tr>
<tr>
<td class='a'>TD #6</td>
<td class='a'>TD #7</td>
<td class='a'>TD #8</td>
</tr>
</table>
JavaScript
$( ".a:eq(2)" ).css( "color", "red" );
$( ".aa:eq(0)" ).css( "color", "blue" );