function detectDevice(user_agent)
{
   var html_1 = '<style type="text/css" media="all">.banda_mobile {background-color: #132D45; font: normal 48px georgia, serif; line-height: 56px; color:#FFFFFF; border:0; margin:0; padding:30px 0 0 0; height:90px; text-align: center; vertical-align:middle} .banda_mobile a {font: bold 48px georgia, serif; text-decoration: none; color:#FFFFFF;}</style><div class="banda_mobile"><a href="http://iphone.caffe.ch">Vai a iphone.caffe.ch per iPhone >';
   var html_2 = '</a></div>'
 
   // Liste des supports mobiles
   var device = new Array(
                  "iPhone"
                );
 
   var max_device = device.length;
 
   for(i=0 ; i<max_device ; i++)
   {
      if(user_agent.indexOf(device[i]) != -1)
      {
         if (device[i] == "iPhone")
         {
            document.write(html_1 + html_2);
         }
         return;
      }
   }
}
detectDevice(navigator.userAgent);