function on001_introduction(str) {
            if(str==null){str='';}
            allClear(str);
            document.t001_introduction.src=str+'950_img/001x_introduction.gif';
}
function off001_introduction(str) {
            if(str==null){str='';}
            document.t001_introduction.src=str+'950_img/001_introduction.gif';
}
function on002_update_log(str) {
            if(str==null){str='';}
            allClear(str);
            document.t002_update_log.src=str+'950_img/002x_update_log.gif';
}
function off002_update_log(str) {
            if(str==null){str='';}
            document.t002_update_log.src=str+'950_img/002_update_log.gif';
}
function on030_various_actions(str) {
            if(str==null){str='';}
            allClear(str);
            document.t030_various_actions.src=str+'950_img/030x_various_actions.gif';
}
function off030_various_actions(str) {
            if(str==null){str='';}
            document.t030_various_actions.src=str+'950_img/030_various_actions.gif';
}
function on010_room_coordinate(str) {
            if(str==null){str='';}
            allClear(str);
            document.t010_room_coordinate.src=str+'950_img/010x_room_coordinate.gif';
}
function off010_room_coordinate(str) {
            if(str==null){str='';}
            document.t010_room_coordinate.src=str+'950_img/010_room_coordinate.gif';
}
function on020_unknown_route(str) {
            if(str==null){str='';}
            allClear(str);
            document.t020_unknown_route.src=str+'950_img/020x_unknown_route.gif';
}
function off020_unknown_route(str) {
            if(str==null){str='';}
            document.t020_unknown_route.src=str+'950_img/020_unknown_route.gif';
}
function on050_for_challenger(str) {
            if(str==null){str='';}
            allClear(str);
            document.t050_for_challenger.src=str+'950_img/050x_for_challenger.gif';
}
function off050_for_challenger(str) {
            if(str==null){str='';}
            document.t050_for_challenger.src=str+'950_img/050_for_challenger.gif';
}
function on040_melody_box(str) {
            if(str==null){str='';}
            allClear(str);
            document.t040_melody_box.src=str+'950_img/040x_melody_box.gif';
}
function off040_melody_box(str) {
            if(str==null){str='';}
            document.t040_melody_box.src=str+'950_img/040_melody_box.gif';
}
function on080_from_arcade(str) {
            if(str==null){str='';}
            allClear(str);
            document.t080_from_arcade.src=str+'950_img/080x_from_arcade.gif';
}
function off080_from_arcade(str) {
            if(str==null){str='';}
            document.t080_from_arcade.src=str+'950_img/080_from_arcade.gif';
}
function on070_the_others(str) {
            if(str==null){str='';}
            allClear(str);
            document.t070_the_others.src=str+'950_img/070x_the_others.gif';
}
function off070_the_others(str) {
            if(str==null){str='';}
            document.t070_the_others.src=str+'950_img/070_the_others.gif';
}
function on003_bbs(str) {
            if(str==null){str='';}
            allClear(str);
            document.t003_bbs.src=str+'950_img/003x_bbs.gif';
}
function off003_bbs(str) {
            if(str==null){str='';}
            document.t003_bbs.src=str+'950_img/003_bbs.gif';
}
function on004_mail(str) {
            if(str==null){str='';}
            allClear(str);
            document.t004_mail.src=str+'950_img/004x_mail.gif';
}
function off004_mail(str) {
            if(str==null){str='';}
            document.t004_mail.src=str+'950_img/004_mail.gif';
}
function on005_link(str) {
            if(str==null){str='';}
            allClear(str);
            document.t005_link.src=str+'950_img/005x_link.gif';
}
function off005_link(str) {
            if(str==null){str='';}
            document.t005_link.src=str+'950_img/005_link.gif';
}
function allClear(str){
            document.t001_introduction.src=str+'950_img/001_introduction.gif';
            document.t002_update_log.src=str+'950_img/002_update_log.gif';
            document.t030_various_actions.src=str+'950_img/030_various_actions.gif';
            document.t010_room_coordinate.src=str+'950_img/010_room_coordinate.gif';
            document.t020_unknown_route.src=str+'950_img/020_unknown_route.gif';
            document.t050_for_challenger.src=str+'950_img/050_for_challenger.gif';
            document.t040_melody_box.src=str+'950_img/040_melody_box.gif';
            document.t080_from_arcade.src=str+'950_img/080_from_arcade.gif';
            document.t070_the_others.src=str+'950_img/070_the_others.gif';
            document.t003_bbs.src=str+'950_img/003_bbs.gif';
            document.t004_mail.src=str+'950_img/004_mail.gif';
            document.t005_link.src=str+'950_img/005_link.gif';
}