if (navigator.appName == 'Netscape' )
{
   //Mac
   if (navigator.appVersion.indexOf("Macintosh") > -1 )
   {
      if (parseFloat(navigator.appVersion) >= 5 )
	  {
		 document.write("<link rel='stylesheet' href='http://www.bettersleep.org/css/mac_net6.css'>");
      }	  else   {
	     document.write("<link rel='stylesheet' href='http://www.bettersleep.org/css/mac_net.css'>");
	  }	 
   //PC
   }
   else
   {
      document.write("<link rel='stylesheet' href='http://www.bettersleep.org/css/pc_net.css'>");
   }
}
// script for Explorer CSS load     
else
{
   //Mac
   if (navigator.appVersion.indexOf("Macintosh") > -1 )
   {
      document.write("<link rel='stylesheet' href='http://www.bettersleep.org/css/mac.css'>");
   }
   //PC
   else
   {
      document.write("<link rel='stylesheet' href='http://www.bettersleep.org/css/pc.css'>");
	}
}