$(document).ready(function(){

  $addressInput = $('#form-item-address').hide();

  $('#edit-join-list').each(function() {
    if (this.checked) {
      $addressInput.show();
    }
  });
  
  $('#edit-join-list').click(function(){
    if (this.checked){
      $addressInput.show();    
    } else {
      $addressInput.hide();    
    }
  });
});