var thedate   = new Date();
var dayofweek = thedate.getUTCDay();
var hourofday = thedate.getUTCHours();

function onAir()
{
   // return TRUE if it's Mon through Sat, 3a-6a UTC

   if (dayofweek != 1 && 
      ((hourofday > 2 && hourofday < 6))) {
     return true;
   }
   return false;
}

function itsSat()
{
   // return TRUE if it's Saturday PT

    if (((dayofweek == 7) && (hourofday > 8)) ||
    ((dayofweek == 0)   && (hourofday < 8 ))) {
     return true;
   }
   return false;
}