function loginsubmit()	{

	if (isEmpty(login.username.value)){
		alert("姓名不能为空");
		return;
	}
	if (isEmpty(login.password.value)){
		alert("密码不能为空");
		return;
	}
	if (validstring1(login.username.value)){
		alert("存在非法字符");
		return;
	}
	if (validstring1(login.password.value)){
		alert("存在非法字符");
		return;
	}
   
	window.document.login.action = "login_index.asp";
	window.document.login.submit();   

}