function map_shibuya() {
  var b1 = window.open('./shibuya.html','map_shibuya','scrollbars=no,width=430,height=550');
}

function map_yokohama() {
  var b2 = window.open('./yokohama.html','map_yokohama','scrollbars=no,width=430,height=590');
}

function map_nagoya() {
  var b3 = window.open('./nagoya.html','map_nagoya','scrollbars=no,width=430,height=590');
}

function map_osaka() {
  var b4 = window.open('./osaka.html','map_osaka','scrollbars=no,width=430,height=590');
}

function map_fukuoka() {
  var b5 = window.open('./fukuoka.html','map_fukuoka','scrollbars=no,width=430,height=590');
}

function map_sapporo() {
  var b6 = window.open("./sapporo.html","map_sapporo","scrollbars=no,width=430,height=590");
}