function login()
{
  var ajax = initAjax();
　var msg = document.getElementById("log_msg");
　var form = document.getElementById("login");
　var account = form.account.value;
　var passwd = form.passwd.value;
　var answer = form.answer.value;
　var remember = form.remember.checked?2592000:0;
  var formhash = form.formhash.value;
  
  
  if(account==''){
	  msg.innerHTML = '请输入帐号';
	  form.account.focus();
	  return false;
  }
  if(passwd==''){
	  msg.innerHTML = '请输入密码';
	  form.passwd.focus();
	  return false;
  }
  if(answer==''){
	  msg.innerHTML = '请输入验证码';
	  form.answer.focus();
	  return false;
  }
  



　var url = "/bbs/logging.php?action=login&loginsubmit=yes&frommyurl=1&random="+Math.random();
　var postStr = "username="+ account +"&password="+ passwd + "&cookietime="+ remember +"&answer="+answer +"&formhash="+formhash +"&loginfield=username";
　ajax.open("POST", url, true);
　ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
  ajax.onreadystatechange = function()
　{
　　if(ajax.readyState == 4 && ajax.status == 200)
　　{
　　　if(ajax.responseText == '验证码错误') 
　　　{
　　　   math(); //换计算
　　　}
　　　if(ajax.responseText == '1')
　　　{
　　　	window.location.href = window.location.href;
　　　}else{
		
		if(ajax.responseText.length>100){
			msg.innerHTML = '登陆失败，请与管理员联系!';
			form.passwd.value='';
			form.answer.value='';
			form.passwd.focus();
			math(); //换计算
	 		alert('登陆失败，请与管理员联系！');
			return false;
		}
		
		var str,url,arr;
		if(ajax.responseText.indexOf('|')!=-1){
			//alert(ajax.responseText);
			arr=ajax.responseText.split('|');
			str=arr[0];
			url=arr[1];
			msg.innerHTML = str;
	 		alert(str);	
			window.location.href=url;
		}else{
			msg.innerHTML = ajax.responseText;
	 		alert(ajax.responseText);	
		}
		
		
	 }
　　}
    else
	{
	   	msg.innerHTML = "<img src='/images/ajax-loader.gif' /> 登陆中...";
	}
　}
　ajax.send(postStr);
}