imgdata_off = new Array("images/bt_d.jpg","images/bt_u.jpg","images/bt_k.jpg","images/bt_kagu.jpg","images/bt_h.jpg","images/bt_kashi.jpg","images/bt_kaisya.jpg","images/bt_otoi.jpg","images/bt_mail.gif");
	img_data_on = new Array("images/bt_d+.jpg","images/bt_u+.jpg","images/bt_k+.jpg","images/bt_kagu+.jpg","images/bt_h+.jpg","images/bt_kashi+.jpg","images/bt_kaisya+.jpg","images/bt_otoi+.jpg","images/bt_mail+.gif");

	preimg_off = new Array();
	preimg_on = new Array();

	for(j=0;j<imgdata_off.length;j++){
		preimg_off[j] = new Image();
		preimg_off[j].src = imgdata_off[j];
		preimg_on[j] = new Image();
		preimg_on[j].src = img_data_on[j];
	}