function play(){
  window.open("calender.htm", "a", "toolbar=no, status=yes, scrollbars=yes,resizable=no,copyhistory=yes,width=650,height=700")
}

function karaoke(){
  window.open("karaoke.htm", "a", "toolbar=no, status=yes, scrollbars=yes,resizable=no,copyhistory=yes,width=650,height=510")
}