Toggle row show & hide by clicking on image

Hi
I have the following code work fine when I click on the on the row and the row below shows or hides. But I would like to change to when the user clicks on the div tag with the arrow class instead.

You can see a working demo of this at http://www.afthab.co.uk/test/

This is the jquery code that currently toggles row show and hide

        $("#table_id tr:odd").addClass("master");
        $("#table_id tr:not(.master)").hide();
        $("#table_id tr:first-child").show();
        $("#table_id tr.master").click(function(){
            $(this).next("tr").toggle();
            $(this).find(".arrow").toggleClass("up");
        }); //#table_id tr.master

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And I have attached the 2 files that contain main code.

Thank you for any help in advance.
index.php
loaddata.php
style.css