function nowStr() {
   var now=new Date()
   var hours=now.getHours()
   var minutes=now.getMinutes()
   timeStr=""+((hours > 12) ? hours - 12 : hours)
   timeStr+=((minutes < 10) ? ":0" : ":") + minutes
   timeStr+=(hours >= 12) ? " PM" : " AM"
   return timeStr
}