function loginIn(){
	user=document.getElementById("m_user");
	password=document.getElementById("m_password");
	randCode=document.getElementById("randCode");
	loginSubmit=document.getElementById("loginSubmit");
	loginSubmit.value='登陆中...';
	loginSubmit.disabled=true;
	$checkUrl="login_ajax.php?user=" + user.value + "&password=" + password.value + "&randCode=" + randCode.value + "&s="+Math.random();
	$result=getXmlData("GET" ,$checkUrl, '', false);
	if ( user.value=='' ){
		alert("请输入用户名!");
		user.focus();
	}else if ( password.value=='' ){
		alert("请输入密码!");
		password.focus();
	}else if ( $result==5 ){
		alert("请输入正确的验证码!");
		randCode.focus();
	}else if ( $result==3 ){
		alert("用户名或者密码错误!");
	}else if ( $result==2 ){
		alert("用户被琐定,有问题请联系管理员!");
	}else if ( $result==1 ){
		loginSubmit.value='登陆成功';
		location.href='member_center.php';
	}else {
		alert("未知错误!");
	}
	loginSubmit.value='登陆';
	loginSubmit.disabled=false;
	return false;
}