Dropkick change function only executes correctly the first time its called

[ChayaCooper]

This change function executes correctly when I only need to set another element's value (line 5), but when I add the rest of the function (lines 3 - 4) it only executes correctly the first time and then stops working after that.

$('#select1').dropkick({
    change: function () {
        var option = $('#select2').find("option[value*=default]");
        option.attr('value', option.attr('value').replace(/_default/g, ''));
        $('#select2').val($('#select1').val());
    }
});

I found a potential solution on a Drupal forum. I'm not a Drupal user so I don't know how to apply it to my situation, but I thought it might be helpful for someone more experienced than myself http://drupal.org/node/1342002 (the last posting by mossill)