function IsDigit(cCheck)  
    {  
    return (('0'<=cCheck) && (cCheck<='9'));  
    }  
  
function IsAlpha(cCheck)  
    {  
    return ((('a'<=cCheck) && (cCheck<='z')) || (('A'<=cCheck) && (cCheck<='Z')))  
    }  

//检测合法email;
   function chkemail(a) 
   {var i=a.length;
  var temp = a.indexOf('@');
  var tempd = a.indexOf('.');
  if (temp >= 1) {
      if ((i-temp) > 3){
          
              if ((i-tempd)>0){
                  return 1;
              }
          
      }
  }
  return 0;
}

function checkInput(nForm)  
{
    var strUserID = nForm.userid.value;  
    if (strUserID == "")  
    {  
        alert("请输入您姓名:!");  
        nForm.userid.focus();  
        return false;  
    }     
    var strPassword = nForm.passwd.value;
  if ( strPassword == "")  
      {  
      alert("年龄不能为空");  
      nForm.passwd.focus();  
      return false;  
  }
    for (var pwIndex=0; pwIndex<strPassword.length; pwIndex++)  
    {  
        cCheck = strPassword.charAt(pwIndex);
        if ( cCheck==' ' || cCheck==':' || cCheck=='\'' || cCheck=='"' )  
        {  
            alert("年龄不能使用空格和单双引号( ,',\")");  
            nForm.passwd.focus();  
            return false;  
        }  
    }
 
 if (nForm.email.value == ""||chkemail(nForm.email.value)==0)
      {
      alert("请输入正确的，可以联络到您的E-mail");
      nForm.email.focus();
      return false;
      }
   

if(nForm.Field_6.value==""){
	alert("手机不能为空,请填写!");
	nForm.Field_6.focus();
	return false;
}


if(nForm.Field_9.value==""){
	alert("职业不能为空,请填写!");
	nForm.Field_9.focus();
	return false;
}


if(nForm.passwd.value==""){
	alert("年龄不能为空,请填写!");
	nForm.passwd.focus();
	return false;
}

if(nForm.Field_4.value==""){
	alert("邮寄地址不能为空,请填写!");
	nForm.Field_4.focus();
	return false;
}

if(nForm.Field_5.value==""){
	alert("主板的型号不能为空,请填写!");
	nForm.Field_5.focus();
	return false;
}


return true;
}