how to toggle attr() in jquery

Question

I have a simple add attribute function:

$(\".list-toggle\").click(function() {
    $(\".list-sort\").attr(\'colspan\', 6);
});

My question is:

Answer 1

If you're feeling fancy:

$('.list-sort').attr('colspan', function(index, attr){
    return attr == 6 ? null : 6;
});

Working Fiddle