Jquery for table plugin

<table>
<tr><td>1</td><td><button class="prev">prev</button></td><td><button class="next">next</button></td></tr>
<tr><td>2</td><td><button class="prev">prev</button></td><td><button class="next">next</button></td></tr>
<tr><td>3</td><td><button class="prev">prev</button></td><td><button class="next">next</button></td></tr>
<tr><td>4</td><td><button class="prev">prev</button></td><td><button class="next">next</button></td></tr>
<tr><td>5</td><td><button class="prev">prev</button></td><td><button class="next">next</button></td></tr>
<tr><td>6</td><td><button class="prev">prev</button></td><td><button class="next">next</button></td></tr>
</table>

jQuery(function($){
$(".next").click(function(){
var tr = $(this).closest("tr");
tr.before(tr.next());
});
$(".prev").click(function(){
var tr = $(this).closest("tr");
tr.after(tr.prev());
});
});