$(document).ready(function(){
$("#block1").click(function(){
$(this).attr("id","block2");
$(this).unbind('click');
$(this).click(function(){
//... новый функционал
});
});
});<table>
<?php foreach($data as $key=>$value):?>
<tr id="id_<?php echo $key; ?>">
<td><?php echo $value['var1']; ?></td>
<td><?php echo $value['var2']; ?></td>
<td><?php echo $value['var3']; ?></td>
</tr>
<?php endforeach; ?>
</table><a href="#" >return false;e.preventDefault();