function doLogin()
{
	$("logininfo").innerHTML="正在尝试登录………";
	if ($("username").value==""){$("logininfo").innerHTML="请输入用户账号。";$("username").focus();return;}
	if ($("password").value==""){$("logininfo").innerHTML="请输入用户口令。";$("password").focus();return;}
	ajax = new sack();

	try
	{
		var retcode = UsbKeyCtrl.CheckEKeyUSB();
		ajax.setVar("retcode",retcode);
	}
	catch(e)
	{
		ajax.setVar("retcode","");
	}
	ajax.setVar("username",$("username").value);
	ajax.setVar("password",$("password").value);
	ajax.requestFile = "login.php";
	ajax.method = "POST";
//	ajax.element='logininfo';
	ajax.onCompletion = function()
	{
		var re = /isValidLogin=(\d)/i;
		if (re.test(this.response)){
			if (RegExp.$1==1)
			{
				re = /isValidLogin=1&JumpTo=(.+)/i;
				re.test(this.response);
				$("logininfo").innerHTML="<b>用户登录成功！</b>";
				location.href=RegExp.$1;
			}
			else
			{
				re = /isValidLogin=0&ErrInfo=(.+)/i;
				re.test(this.response);
				$("logininfo").innerHTML=RegExp.$1;
			}
		}else{
			re = /ErrInfo=(.+)/i;
			re.test(this.response);
			$("logininfo").innerHTML=RegExp.$1;
		}
	}
	ajax.runAJAX();
}