function change_rent(){
  if (document.getElementById("price_span") != null){
    var rent_size = 9;
    var span = document.getElementById("price_span").value;
    if (span == "rent_day"){
      var rent_select_array = ["指定しない",
                            "2,000円",
                            "3,000円",
                            "4,000円",
                            "5,000円",
                            "6,000円",
                            "7,000円",
                            "8,000円",
                            "9,000円",
                            "10,000円",]
      for (i=0; i <= rent_size; i++){
        document.getElementById("price_rent_min").options[i].text = rent_select_array[i];
      }
      for (i=0; i <= rent_size; i++){
        document.getElementById("price_rent_max").options[i].text = rent_select_array[i];
      }
    } else if (span == "rent_week"){
      var rent_select_array = ["指定しない",
                            "14,000円",
                            "21,000円",
                            "28,000円",
                            "35,000円",
                            "42,000円",
                            "49,000円",
                            "56,000円",
                            "63,000円",
                            "70,000円",]
      for (i=0; i <= rent_size; i++){
        document.getElementById("price_rent_min").options[i].text = rent_select_array[i];
      }
      for (i=0; i <= rent_size; i++){
        document.getElementById("price_rent_max").options[i].text = rent_select_array[i];
      }
    } else {
      var rent_select_array = ["指定しない",
                            "60,000円",
                            "90,000円",
                            "120,000円",
                            "150,000円",
                            "180,000円",
                            "210,000円",
                            "240,000円",
                            "270,000円",
                            "300,000円",]
      for (i=0; i <= rent_size; i++){
        document.getElementById("price_rent_min").options[i].text = rent_select_array[i];
      }
      for (i=0; i <= rent_size; i++){
        document.getElementById("price_rent_max").options[i].text = rent_select_array[i];
      }

    }
  }
}




$(change_rent);