var isIphone = false; 
var isAndroidPhone = false; 
var isTierTablet = false; 
var isTierIphone = false; 
var isTierRichCss = false; 
var isTierGenericMobile = false; 
var engineWebKit = "webkit";
var deviceIphone = "iphone";
var deviceIpod = "ipod";
var deviceIpad = "ipad";
var deviceMacPpc = "macintosh";
var deviceAndroid = "android";
var deviceGoogleTV = "googletv";
var deviceXoom = "xoom";
var deviceHtcFlyer = "htc_flyer";
var deviceNuvifone = "nuvifone";
var deviceSymbian = "symbian";
var deviceS60 = "series60";
var deviceS70 = "series70";
var deviceS80 = "series80";
var deviceS90 = "series90";
var deviceWinPhone7 = "windows phone os 7"; 
var deviceWinMob = "windows ce";
var deviceWindows = "windows";
var deviceIeMob = "iemobile";
var devicePpc = "ppc";
var enginePie = "wm5 pie";
var deviceBB = "blackberry";
var vndRIM = "vnd.rim";
var deviceBBStorm = "blackberry95";
var deviceBBBold = "blackberry97";
var deviceBBTour = "blackberry96";
var deviceBBCurve = "blackberry89";
var deviceBBTorch = "blackberry 98";
var deviceBBPlaybook = "playbook";
var devicePalm = "palm";
var deviceWebOS = "webos";
var deviceWebOShp = "hpwos";
var engineBlazer = "blazer";
var engineXiino = "xiino";
var deviceKindle = "kindle";
var vndwap = "vnd.wap";
var wml = "wml";
var deviceTablet = "tablet";
var deviceBrew = "brew";
var deviceDanger = "danger";
var deviceHiptop = "hiptop";
var devicePlaystation = "playstation";
var deviceNintendoDs = "nitro";
var deviceNintendo = "nintendo";
var deviceWii = "wii";
var deviceXbox = "xbox";
var deviceArchos = "archos";
var engineOpera = "opera";
var engineNetfront = "netfront";
var engineUpBrowser = "up.browser";
var engineOpenWeb = "openweb";
var deviceMidp = "midp";
var uplink = "up.link";
var engineTelecaQ = 'teleca q';
var devicePda = "pda";
var mini = "mini";
var mobile = "mobile";
var mobi = "mobi";
var maemo = "maemo";
var linux = "linux";
var qtembedded = "qt embedded";
var mylocom2 = "com2";
var manuSonyEricsson = "sonyericsson";
var manuericsson = "ericsson";
var manuSamsung1 = "sec-sgh";
var manuSony = "sony";
var manuHtc = "htc";
var svcDocomo = "docomo";
var svcKddi = "kddi";
var svcVodafone = "vodafone";
var disUpdate = "update";
var uagent = navigator.userAgent.toLowerCase();

function DetectIphone()
{
   if (uagent.search(deviceIphone) > -1)
   {
      //The iPad and iPod Touch say they're an iPhone! So let's disambiguate.
      if (DetectIpad() || DetectIpod())
         return false;
      //Yay! It's an iPhone!
      else 
         return true;
   }
   else
      return false;
}

function DetectIpod()
{
   if (uagent.search(deviceIpod) > -1)
      return true;
   else
      return false;
}


function DetectIpad()
{
   if (uagent.search(deviceIpad) > -1  && DetectWebkit())
      return true;
   else
      return false;
}


function DetectIphoneOrIpod()
{
   //We repeat the searches here because some iPods 
   //  may report themselves as an iPhone, which is ok.
   if (uagent.search(deviceIphone) > -1 ||
       uagent.search(deviceIpod) > -1)
       return true;
    else
       return false;
}


function DetectIos()
{
   if (DetectIphoneOrIpod() || DetectIpad())
      return true;
   else
      return false;
}


function DetectAndroid()
{
   if ((uagent.search(deviceAndroid) > -1) || DetectGoogleTV())
      return true;
   //Special check for the HTC Flyer 7" tablet. It should report here.
   if (uagent.search(deviceHtcFlyer) > -1)
      return true;
   else
      return false;
}


function DetectAndroidPhone()
{
   if (DetectAndroid() && (uagent.search(mobile) > -1))
      return true;
   //Special check for the HTC Flyer 7" tablet. It should report here.
   if (uagent.search(deviceHtcFlyer) > -1)
      return true;
   else
      return false;
}


function DetectAndroidTablet()
{
   //Special check for the HTC Flyer 7" tablet. It should NOT report here.
   if (uagent.search(deviceHtcFlyer) > -1)
      return false;
   if (DetectAndroid() && !(uagent.search(mobile) > -1))
      return true;
   else
      return false;
}


function DetectAndroidWebKit()
{
   if (DetectAndroid() && DetectWebkit())
      return true;
   else
      return false;
}


function DetectGoogleTV()
{
   if (uagent.search(deviceGoogleTV) > -1)
      return true;
   else
      return false;
}


function DetectWebkit()
{
   if (uagent.search(engineWebKit) > -1)
      return true;
   else
      return false;
}


function DetectS60OssBrowser()
{
   if (DetectWebkit())
   {
     if ((uagent.search(deviceS60) > -1 || 
          uagent.search(deviceSymbian) > -1))
        return true;
     else
        return false;
   }
   else
      return false;
}


function DetectSymbianOS()
{
   if (uagent.search(deviceSymbian) > -1 ||
       uagent.search(deviceS60) > -1 ||
       uagent.search(deviceS70) > -1 ||
       uagent.search(deviceS80) > -1 ||
       uagent.search(deviceS90) > -1)
      return true;
   else
      return false;
}


function DetectWindowsPhone7()
{
   if (uagent.search(deviceWinPhone7) > -1)
      return true;
   else
      return false;
}


function DetectWindowsMobile()
{
   //Exclude new Windows Phone 7.
   if (DetectWindowsPhone7())
      return false;
   //Most devices use 'Windows CE', but some report 'iemobile' 
   //  and some older ones report as 'PIE' for Pocket IE. 
   if (uagent.search(deviceWinMob) > -1 ||
       uagent.search(deviceIeMob) > -1 ||
       uagent.search(enginePie) > -1)
      return true;
   //Test for Windows Mobile PPC but not old Macintosh PowerPC.
   if ((uagent.search(devicePpc) > -1) && 
       !(uagent.search(deviceMacPpc) > -1))
      return true;
   //Test for Windwos Mobile-based HTC devices.
   if (uagent.search(manuHtc) > -1 &&
       uagent.search(deviceWindows) > -1)
      return true;
   else
      return false;
}


function DetectBlackBerry()
{
   if (uagent.search(deviceBB) > -1)
      return true;
   if (uagent.search(vndRIM) > -1)
      return true;
   else
      return false;
}


function DetectBlackBerryTablet()
{
   if (uagent.search(deviceBBPlaybook) > -1)
      return true;
   else
      return false;
}


function DetectBlackBerryWebKit()
{
   if (DetectBlackBerry() &&
       uagent.search(engineWebKit) > -1)
      return true;
   else
      return false;
}


function DetectBlackBerryTouch()
{
   if (DetectBlackBerry() &&
        ((uagent.search(deviceBBStorm) > -1) ||
        (uagent.search(deviceBBTorch) > -1)))
      return true;
   else
      return false;
}


function DetectBlackBerryHigh()
{
   //Disambiguate for BlackBerry OS 6 (WebKit) browser
   if (DetectBlackBerryWebKit())
      return false;
   if (DetectBlackBerry())
   {
     if (DetectBlackBerryTouch() ||
        uagent.search(deviceBBBold) > -1 || 
        uagent.search(deviceBBTour) > -1 || 
        uagent.search(deviceBBCurve) > -1)
        return true;
     else
        return false;
   }
   else
      return false;
}


function DetectBlackBerryLow()
{
   if (DetectBlackBerry())
   {
     //Assume that if it's not in the High tier or has WebKit, then it's Low.
     if (DetectBlackBerryHigh() || DetectBlackBerryWebKit())
        return false;
     else
        return true;
   }
   else
      return false;
}


function DetectPalmOS()
{
   //Most devices nowadays report as 'Palm', 
   //  but some older ones reported as Blazer or Xiino.
   if (uagent.search(devicePalm) > -1 ||
       uagent.search(engineBlazer) > -1 ||
       uagent.search(engineXiino) > -1)
   {
     //Make sure it's not WebOS first
     if (DetectPalmWebOS())
        return false;
     else
        return true;
   }
   else
      return false;
}


function DetectPalmWebOS()
{
   if (uagent.search(deviceWebOS) > -1)
      return true;
   else
      return false;
}


function DetectWebOSTablet()
{
   if (uagent.search(deviceWebOShp) > -1 &&
       uagent.search(deviceTablet) > -1)
      return true;
   else
      return false;
}


function DetectGarminNuvifone()
{
   if (uagent.search(deviceNuvifone) > -1)
      return true;
   else
      return false;
}



function DetectSmartphone()
{
   if (DetectIphoneOrIpod() 
      || DetectAndroidPhone()
      || DetectS60OssBrowser()
      || DetectSymbianOS()
      || DetectWindowsMobile()
      || DetectWindowsPhone7()
      || DetectBlackBerry()
      || DetectPalmWebOS()
      || DetectPalmOS()
      || DetectGarminNuvifone())
      return true;

   //Otherwise, return false.
   return false;
};


function DetectArchos()
{
   if (uagent.search(deviceArchos) > -1)
      return true;
   else
      return false;
}


function DetectBrewDevice()
{
   if (uagent.search(deviceBrew) > -1)
      return true;
   else
      return false;
}


function DetectDangerHiptop()
{
   if (uagent.search(deviceDanger) > -1 ||
       uagent.search(deviceHiptop) > -1)
      return true;
   else
      return false;
}


function DetectMaemoTablet()
{
   if (uagent.search(maemo) > -1)
      return true;
   //For Nokia N810, must be Linux + Tablet, or else it could be something else.
   if ((uagent.search(linux) > -1) 
       && (uagent.search(deviceTablet) > -1)
       && !DetectWebOSTablet())
      return true;
   else
      return false;
}


function DetectSonyMylo()
{
   if (uagent.search(manuSony) > -1)
   {
     if (uagent.search(qtembedded) > -1 ||
         uagent.search(mylocom2) > -1)
        return true;
     else
        return false;
   }
   else
      return false;
}


function DetectOperaMobile()
{
   if (uagent.search(engineOpera) > -1)
   {
     if (uagent.search(mini) > -1 ||
         uagent.search(mobi) > -1)
        return true;
     else
        return false;
   }
   else
      return false;
}


function DetectSonyPlaystation()
{
   if (uagent.search(devicePlaystation) > -1)
      return true;
   else
      return false;
};

function DetectNintendo()
{
   if (uagent.search(deviceNintendo) > -1   || 
	uagent.search(deviceWii) > -1 ||
	uagent.search(deviceNintendoDs) > -1)
      return true;
   else
      return false;
};


function DetectXbox()
{
   if (uagent.search(deviceXbox) > -1)
      return true;
   else
      return false;
};


function DetectGameConsole()
{
   if (DetectSonyPlaystation())
      return true;
   if (DetectNintendo())
      return true;
   if (DetectXbox())
      return true;
   else
      return false;
};


function DetectKindle()
{
   if (uagent.search(deviceKindle) > -1)
      return true;
   else
      return false;
}


function DetectMobileQuick()
{

   if (DetectTierTablet())
      return false;


   if (DetectSmartphone())
      return true;

   if (uagent.search(deviceMidp) > -1 ||
	DetectBrewDevice())
      return true;

   if (DetectOperaMobile())
      return true;

   if (uagent.search(engineNetfront) > -1)
      return true;
   if (uagent.search(engineUpBrowser) > -1)
      return true;
   if (uagent.search(engineOpenWeb) > -1)
      return true;

   if (DetectDangerHiptop())
      return true;
      
   if (DetectMaemoTablet())
      return true;
   if (DetectArchos())
      return true;

   if ((uagent.search(devicePda) > -1) &&
        !(uagent.search(disUpdate) > -1)) 
      return true;
   if (uagent.search(mobile) > -1)
      return true;

   if (DetectKindle())
      return true;
      
   return false;
};


function DetectMobileLong()
{
   if (DetectMobileQuick())
      return true;
   if (DetectGameConsole())
      return true;
   if (DetectSonyMylo())
      return true;

   //Detect for certain very old devices with stupid useragent strings.
   if (uagent.search(manuSamsung1) > -1 ||
	uagent.search(manuSonyEricsson) > -1 || 
	uagent.search(manuericsson) > -1)
      return true;

   if (uagent.search(svcDocomo) > -1)
      return true;
   if (uagent.search(svcKddi) > -1)
      return true;
   if (uagent.search(svcVodafone) > -1)
      return true;


   return false;
};


function DetectTierTablet()
{
   if (DetectIpad() 
        || DetectAndroidTablet()
        || DetectBlackBerryTablet()
        || DetectWebOSTablet())
      return true;
   else
      return false;
};


function DetectTierIphone()
{
   if (DetectIphoneOrIpod())
      return true;
   if (DetectAndroidPhone())
      return true;
   if (DetectBlackBerryWebKit() && DetectBlackBerryTouch())
      return true;
   if (DetectPalmWebOS())
      return true;
   if (DetectGarminNuvifone())
      return true;
   if (DetectMaemoTablet())
      return true;
   else
      return false;
};

function DetectTierRichCss()
{
    if (DetectMobileQuick())
    {
       if (DetectTierIphone())
          return false;
          
       //The following devices are explicitly ok.
       if (DetectWebkit())
          return true;
       if (DetectS60OssBrowser())
          return true;

       //Note: 'High' BlackBerry devices ONLY
       if (DetectBlackBerryHigh())
          return true;
          
       //WP7's IE-7-based browser isn't good enough for iPhone Tier.
       if (DetectWindowsPhone7())
          return true;
       if (DetectWindowsMobile())
          return true;
          
       if (uagent.search(engineTelecaQ) > -1)
          return true;
          
       else
          return false;
    }
    else
      return false;
};

function DetectTierOtherPhones()
{
    if (DetectMobileLong())
    {
       //Exclude devices in the other 2 categories
       if (DetectTierIphone() || DetectTierRichCss())
          return false;

       //Otherwise, it's a YES
       else
          return true;
    }
    else
      return false;
};


function InitDeviceScan()
{
    //We'll use these 4 variables to speed other processing. They're super common.
    isIphone = DetectIphoneOrIpod();
    isAndroidPhone = DetectAndroidPhone();
    isTierIphone = DetectTierIphone();
    isTierTablet = DetectTierTablet();

    //Optional: Comment these out if you don't need them.
    //isTierRichCss = DetectTierRichCss();
    //isTierGenericMobile = DetectTierOtherPhones();
};

//Now, run the initialization method.
InitDeviceScan()