function title_button_over(object) {
  if (object.className == 'title_button') object.className = 'title_button_over';
  else if (object.className == 'title_button_over') object.className = 'title_button_click';
}

function title_button_out(object) {
  if (object.className == 'title_button_over') object.className = 'title_button';
  else if (object.className == 'title_button_click') object.className = 'title_button_over';
}

function title_button_down(object) {
  if (object.className == 'title_button_over') object.className = 'title_button_click';
}

function title_button_up(object) {
  if (object.className == 'title_button_click') object.className = 'title_button_over';
}