img = new Array("bt00T_s.jpg","bt002_s.jpg","bt003_s.jpg","bt004_s.jpg","bt005_s.jpg","bt006_s.jpg","bt007_s.jpg");
bfImg = new Array();
for(i=0; i<img.length; i++) {
  bfImg[i] = new Image();
  bfImg[i].src = img[i];
}