function whichButton(event) {
  keyCode = event.keyCode;

  if (keyCode == 49) {
    new_channel(0);
  }
  if (keyCode == 50 && 1 <= cnt_channels) {
    new_channel(1);
  }
  if(keyCode == 51 && 2 <= cnt_channels) {
    new_channel(2);
  }
  if(keyCode == 52 && 3 <= cnt_channels) {
    new_channel(3);
  }
  if(keyCode == 53 && 4 <= cnt_channels) {
    new_channel(4);
  }
  if(keyCode == 54 && 5 <= cnt_channels) {
    new_channel(5);
  }
  if(keyCode == 55 && 6 <= cnt_channels) {
    new_channel(6);
  }
  if(keyCode == 56 && 7 <= cnt_channels) {
    new_channel(7);
  }
  if(keyCode == 57 && 8 <= cnt_channels) {
    new_channel(8);
  }
  if(keyCode == 80) {
    do_pause();
  }
  if(keyCode == 191) {
    change_news(true);
  }
  if(keyCode == 188) {
    change_news(false);
  }
}

//document.onkeydown=function(e) {
//  if(e.which == 51 && 2 <= cnt_channels) {
//    new_channel(2);
//  }
//}