var searchHiddenSort;
	$('.ukn-search-sort a').click(function(e) {
		if ($(this).hasClass('ukn-search-sort-selected')) { return false; }
		var text = $(this).text();
		e.preventDefault();
		$('.ukn-search-sort-date, .ukn-search-sort-relevance').removeClass('ukn-search-sort-selected');
		$(this).addClass('ukn-search-sort-selected').parents('fieldset').find('.ukn-search-box input').focus();
		$(".ukn-form-hidden-search-sort").val(text);
		
		if(searchHiddenSort) return;
		searchHiddenSort = true;
		$('.ukn-search fieldset').prepend('<input class="ukn-form-hidden-search-sort" type="hidden" name="sort" value=' + text + ' />');
	});

If on do nothing. If on make off. If off make on. Alter external value and focus.

Search sorting buttons

sort, date, search, jquery

jQuery