Swap out to === for the true comparison to avoid possible coercion issues

		$(actionCheckboxes).click(function(event) {

			if (!event) { event = window.event; }

			var target = event.target ? event.target : event.srcElement;

			if (lastChecked && $.data(lastChecked) != $.data(target) && event.shiftKey == true) {

			if (lastChecked && $.data(lastChecked) != $.data(target) && event.shiftKey === true) {

				var inrange = false;

				$(lastChecked).attr("checked", target.checked)

					.parent().parent().toggleClass(options.selectedClass, target.checked);