get next tr
HTML
<table border="1">
<tr><td>1</td><td>value</td></tr>
<tr><td>1.1</td><td>value</td></tr>
<tr><td>2</td><td>value</td></tr>
<tr><td>2.1</td><td>value</td></tr>
<tr><td>2.2</td><td>value</td></tr>
</table>
JavaScript
$(document).on('click', 'tr', function(){
alert($(this).last('tr').children().html())
})