function validChars(e, goods) {
	var key, keychar;
	key = (window.event) ? window.event.keyCode : ((e) ? e.which : null);
	if (key == null) return true;

	keychar = String.fromCharCode(key);
	keychar = keychar.toLowerCase();
	goods = goods.toLowerCase();

	if (goods.indexOf(keychar) != -1)
		return true;

	if (key==null || key==0 || key==8 || key==9 || key==13 || key==27)
		return true;

	return false;
}