[jQuery] am I in the last table row?

[[EMAIL PROTECTED]]

Hi, I have this HTML code

<table>
        <tr><td id="1" class="tab">...</td></tr>
        <tr><td id="2" class="tab">...</td></tr>
        <tr><td id="3" class="tab">...</td></tr>
        <tr><td id="4" class="tab">...</td></tr>
</table>

and have defined this function

                        $('td.tab').click( function() {
                           ...
                        });

What I want to do is determine within the function if the user clicked
on the last table row (in the above example, the table row with
id="4").  The ids are not fixed, I just included them to illustrate
what I want to do.

Thanks, - Dave