function preload() {

 var img01 = new Image();

 var img02 = new Image();

 var img03 = new Image();

 var img04 = new Image();

 var img05 = new Image();

 var img05 = new Image();

 var img06 = new Image();

 var img07 = new Image();

 var img08 = new Image();

 var img09 = new Image();

 var img10 = new Image();

 var img11 = new Image();

 var img12 = new Image();

 var img13 = new Image();

 var img14 = new Image();

 var img15 = new Image();

 var img16 = new Image();

 var img17 = new Image();

 var img18 = new Image();

 var img19 = new Image();

 var img20 = new Image();

 var img21 = new Image();

 var img22 = new Image();



 img01.src = "../img/bt001_sub001_on.gif";

 img02.src = "../img/bt001_sub002_on.gif";

 img03.src = "../img/bt001_sub003_on.gif";

 img04.src = "../img/bt001_sub004_on.gif";

 img05.src = "../img/bt001_sub005_on.gif";

 img06.src = "../img/bt001_sub001.gif";

 img07.src = "../img/bt001_sub002.gif";

 img08.src = "../img/bt001_sub003.gif";

 img09.src = "../img/bt001_sub004.gif";

 img10.src = "../img/bt001_sub005.gif";

 img11.src = "../img/bt002_sub001_on.gif";

 img12.src = "../img/bt002_sub002_on.gif";

 img13.src = "../img/bt002_sub004_on.gif";

 img14.src = "../img/bt002_sub001.gif";

 img15.src = "../img/bt002_sub002.gif";

 img16.src = "../img/bt002_sub004.gif";

 img17.src = "../img/bt003_sub001_on.gif";

 img18.src = "../img/bt003_sub002_on.gif";

 img19.src = "../img/bt003_sub001.gif";

 img20.src = "../img/bt003_sub002.gif";

 img21.src = "../img/bt004_sub002_on.gif";

 img22.src = "../img/bt004_sub002.gif";}