function open_recommend_form() {
  form = "<br /><br />キーワードを入力して漫画を検索してください。<br /><form action=\"cgi-bin/recommend_search.cgi\" method=\"POST\"><input type=\"text\" name=\"keyword\" /><input type=\"submit\" value=\"検索\"></form>";
  close_button = "<a href=\"javascript:close_recommend_form();\">オススメ漫画を書く</a>";
  document.getElementById("submit").innerHTML = close_button + form;
}

function close_recommend_form() {
  open_button = "<a href=\"javascript:open_recommend_form();\">オススメ漫画を書く</a>";
  document.getElementById("submit").innerHTML = open_button;
}