var img1 = new Image();  var img2 = new Image();
var img3 = new Image();  var img4 = new Image();
var img5 = new Image();  var img6 = new Image();
var img7 = new Image();  var img8 = new Image();
var img9 = 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();


img1.src = "./image_top/btn_01.jpg";
img2.src = "./image_top/btn_11.jpg"; 
img3.src = "./image_top/btn_02.jpg";
img4.src = "./image_top/btn_12.jpg"; 
img5.src = "./image_top/btn_03.jpg";
img6.src = "./image_top/btn_13.jpg"; 
img7.src = "./image_top/btn_04.jpg";
img8.src = "./image_top/btn_14.jpg"; 
img9.src = "./image_top/btn_05.jpg";
img10.src = "./image_top/btn_15.jpg"; 
img11.src = "./image_top/btn_06.jpg";
img12.src = "./image_top/btn_16.jpg"; 
img13.src = "./image_top/btn_07.jpg";
img14.src = "./image_top/btn_17.jpg";
img15.src = "./image_top/btn_08.jpg";
img16.src = "./image_top/btn_18.jpg";
img17.src = "./image_top/btn_09.jpg";
img18.src = "./image_top/btn_19.jpg";



function cimg1(){document.img1.src=img1.src;}
function cimg2(){document.img1.src=img2.src;}
function cimg3(){document.img3.src=img3.src;}
function cimg4(){document.img3.src=img4.src;}
function cimg5(){document.img5.src=img5.src;}
function cimg6(){document.img5.src=img6.src;}
function cimg7(){document.img7.src=img7.src;}
function cimg8(){document.img7.src=img8.src;}
function cimg9(){document.img9.src=img9.src;}
function cimg10(){document.img9.src=img10.src;}
function cimg11(){document.img11.src=img11.src;}
function cimg12(){document.img11.src=img12.src;}
function cimg13(){document.img13.src=img13.src;}
function cimg14(){document.img13.src=img14.src;}
function cimg15(){document.img15.src=img15.src;}
function cimg16(){document.img15.src=img16.src;}
function cimg17(){document.img17.src=img17.src;}
function cimg18(){document.img17.src=img18.src;}