function check()
{
    if (login.username.value=="") 
		alert("请输入用户名！");
	else if (login.password.value=="") 
		alert("请输入登录密码！");
	else
		login.submit();
}
function openwin(page,size)
{
window.open(page,"newuser","toolbar=no,location=no,directories=no,status=no,menubar=yes,scrollbars=yes,resizable=no,"+ size);
}