function setCookie(name, value, days)
{
   if (days)
   {
      var date = new Date();
      date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
      var expires = '; expires=' + date.toGMTString();
   }
   else
      var expires = '';

   document.cookie = name + '=' + value + expires + '; path=/';
}

function getCookie(name)
{
   var nameEQ = name + '=';

   var ca = document.cookie.split(';');
   for(var i = 0; i < ca.length; i++)
   {
      var c = ca[i];
      while (c.charAt(0) == ' ')
         c = c.substring(1, c.length);

      if (c.indexOf(nameEQ) == 0)
         return c.substring(nameEQ.length, c.length);
   }

   return null;
}

function delCookie(name)
{
   setCookie(name, '', -1);
}