Check all children who are visible?

[Ryan]

I'm using this script to check only visible children

function onTreeDataBound(e) {
    $('#AjaxTreeView').find("li:has(ul)")
                .find('> div > .t-checkbox :checkbox')
                .bind('click', function (e) {
                    var isChecked = $(e.target).is(':checked');
                    var treeView = $($(e.target).closest('.t-treeview')).data('tTreeView');
                    var checkboxes = $(e.target).closest('.t-item')
                                                .find('> ul > li > div:visible > .t-checkbox :checkbox');
                    $.each(checkboxes, function (index, checkbox) {
                        $(checkbox).attr('checked', isChecked ? true : false);
                        treeView.checkboxClick(e, checkbox);
                    });
                });
}

This only works for the level directly beneath the parent. I'd like to check all visible-subchildren (grandchildren, great-grandchildren etc) as well. I'm not quite the jQuery guru yet, so any assistance would be appreciated. Thanks!