
/**
 * Bind `el` event `type` to `fn`.
 *
 * @param {Element} el
 * @param {String} type
 * @param {Function} fn
 * @param {Boolean} capture
 * @return {Function}
 * @api public
 */

exports.bind = function(el, type, fn, capture){
  if (el.addEventListener) {
    el.addEventListener(type, fn, capture);
  } else {
    el.attachEvent('on' + type, fn);
  }
  return fn;
};

/**
 * Unbind `el` event `type`'s callback `fn`.
 *
 * @param {Element} el
 * @param {String} type
 * @param {Function} fn
 * @param {Boolean} capture
 * @return {Function}
 * @api public
 */

exports.unbind = function(el, type, fn, capture){
  if (el.removeEventListener) {
    el.removeEventListener(type, fn, capture);
  } else {
    el.detachEvent('on' + type, fn);
  }
  return fn;
};
