Topic: Redirect to Mobile with JavaScript
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Description: This script will show you how to catch the device and redirect to a mobile version of your website.
Notes: This was taked from the source of the following site: http://www.porsche.com/usa/
Script is shown below

<script type="text/javascript">
<!--
var arrMobileClients=[
   "iphone",
   "ipod" /*,
   "240x320",
   "benq",
   "blackberry",
   "mda",
   "midp",
   "mot-",
   "netfront",
   "nokia",
   "opera mini",
   "panasonic",
   "philips",
   "pocket pc",
   "portalmmm",
   "sagem",
   "samsung",
   "sda",
   "sgh-",
   "sharp",
   "sie-",
   "sonyericsson",
   "symbian",
   "vodafone",
   "windows ce",
   "xda"*/
];

function isMobileNavigator(userAgent)
{
   try
   {
      userAgent=userAgent.toLowerCase();
      for (var i=0; i < arrMobileClients.length; i++)
      {
         if (userAgent.indexOf(arrMobileClients[i]) != -1)
         {
            return true;
         }
      }
   }
   catch (e)
   {
      // NOP
   }
   return false;
}

function goMobile(URL)
{
   var params = URL.split("?");
   if (params.length == 2)
   {
      if(params[1].indexOf("keephost=true") != -1)
      return false;
   }
   else if(URL.indexOf("mobile.") != -1)
   {
      return false;
   }
   return true;
}

var arrMobilePools=["usa"];
function isMobilePool()
{
   /*
   try
   {
      for (var i=0; i < arrRedirectHosts.length; i++)
      {
         if (CURRENTPOOL == arrRedirectHosts[i])
         {
            return true;
         }
      }
   }
   catch (e)
   {
      // NOP
   }
   */
   return true;
}

function mobileRedirector()
{
   try
   {
      if (isMobileNavigator(navigator.userAgent))
      {
         if(isMobilePool())
         {
            //alert(navigator.userAgent);
            var URL = document.location.href.toLowerCase();
            if(goMobile(URL))
            {
               URL = URL.replace("http://www.", "http://mobile.");
               URL = URL.replace("https://preview.", "https://preview.mobile.");
               document.location.href = URL;
            }
         }
      }
   }
   catch (e)
   {
      // NOP
   }
}

// check whether to continue loading or redirect to the mobile URL.
mobileRedirector();
-->
</script>