Img_arry[0] = new Img_obj('../pic/pic_1.jpg');
Img_arry[1] = new Img_obj('../pic/pic_2.jpg');
Img_arry[2] = new Img_obj('../pic/pic_3.jpg');
Img_arry[3] = new Img_obj('../pic/pic_4.jpg');
Img_arry[4] = new Img_obj('../pic/pic_5.jpg');