//订阅newsletter
function subNletter(obj) {
	var email = obj.value;
	if (email.length == 0 || email == "请输入您的邮件地址") {
		alert("请输入Email地址");
		obj.focus();
		return false;
	}
	else if (!/^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(email)) {
		alert("Email格式不正确");
		obj.focus();
		return false;
	}
	else {
		window.open('/users/subscribe.aspx?mail=' + encodeURI(email));
		return true;
	}
}