jQuery: change the order of two rows of a table

I want to change the order of two rows in a table.

I have this code:

console.log(position.parent().parent().prev());
console.log(position.parent().parent());
//I expected this line do the work, but no...
$(this).parent().parent().prev().insertAfter($(this).parent().parent());

That is printing this:

<tr>​
<td>​Element 1​</td>​
<td>​…​</td>​
<td>​2008-02-02​</td>​
<td class=​"jander" data-pos=​"0" data-category=​"1">​…​</td>​
</tr>​

<tr>​
<td>​Element 2​</td>​
<td>​…​</td>​
<td>​2007-02-02​</td>​
<td class=​"jander" data-pos=​"1" data-category=​"1">​…​</td>​
</tr>​

Any idea?

Regards

Javi