function autoscroll(field) {
	$('field-builder').scrollTop = $(field).cumulativeScrollOffset()[1];
};

function toggle_extractor_field(field) {
	if($("select_" + field).checked) {
		$(field).appear({ duration: 0.4 });
		autoscroll.delay(0.3, field);
	}
	else {
		$(field).fade({ duration: 0.2 });
	}
}

function set_extractor_fields() {
	$$('*[id^="select_"]').each(
		function(tag) {
			toggle_extractor_field(tag.id.replace(/select_/, ''), tag.checked);
		}
	);
}

function clear_all_checkboxes(match) {
	$$('*[id^="select_"]').each(
		function(tag) {
			if(tag.disabled == false) {
				tag.checked = false;
				toggle_extractor_field(tag.id.replace(/select_/, ''), tag.checked);
			}
		}
	);
}