function joinTeam(team_id, elem_id) {
  jx.load('/team/join?team_id=' + team_id,
    function(response) {
      document.getElementById(elem_id).innerHTML = response;
    }
  )
}

function set_attending_status(game_id, attending_status, elem_id) {
  jx.load('/game/attending_status?game_id=' + game_id + ';status=' + attending_status,
    function(response) {
      document.getElementById(elem_id).innerHTML = response;
    }
  )
}