function showimg1(){
     document.area1.src = "images/hokaido_map.jpg";
}
function showimg2(){
     document.area1.src = "images/higasi_nippon_map.jpg";
}
function showimg3(){
     document.area1.src = "images/tokyo_map.jpg";
}
function showimg4(){
     document.area1.src = "images/nagoya_map.jpg";
}
function showimg5(){
     document.area1.src = "images/kyoto_map.jpg";
}
function showimg6(){
     document.area1.src = "images/osaka_map2.jpg";
}
function showimg7(){
     document.area1.src = "images/osaka_map.jpg";
}
function showimg8(){
     document.area1.src = "images/kinki_map.jpg";
}
function showimg9(){
     document.area1.src = "images/osaka_tr_map.jpg";
}
function showimg10(){
     document.area1.src = "images/sapporo_map.jpg";
}