function Check_login_info()
	{
	var _UserName=document.all("UserName");
	var UserName=_UserName.value;
	var _Password=document.all("Password");
	var Password=_Password.value;
	if(UserName==""){
	alert("用户名不能为空");
	_UserName.focus();
	return false;
	}
	if(Password==""){
	alert("密码不能为空");
	_Password.focus();
	return false;
	}
}