var signAjax;
function do_signin()
{
	if (signin_form['account'].value != '' && signin_form['name'].value != '' && signin_form['password'].value != '')
	{
		signAjax = createAjax();
		signAjax.onreadystatechange = function()
		{
			if (signAjax.readyState == 4)
			{
				if (signAjax.status == 200)
				{
					if (signAjax.responseText == 'SUCCEED')
					{
						location.href = signin_form['url'].value;
					} else
						alert('用户名或密码错误!');
				} else
					alert(regAjax.status);
			} 
		}
		var s = 'a=' + signin_form['account'].value;
		s += '&u=' + signin_form['name'].value;
		s += '&p=' + hex_md5(signin_form['password'].value);
		signAjax.open('POST','_core/signin.php', true);
		signAjax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		signAjax.send(s);
	}
	return false;
}