function buildSet($field, $inverse) {
	if($field) {
		$field.elements = document.getElementsByClassName("_" + $field.name);
		$field.onclick = showSet;
		$field.inverse = $inverse ? true : false;
		$field.onclick();
	}
}

function showSet() {
	var $field = this;
	for(var $i = 0; $i < $field.elements.length; $i ++) $field.elements[$i].style.display = $field.checked != $field.inverse ? "" : "none";
}