data = new Array("../images/2nd/bu_top.gif","../images/2nd/bu_corp.gif","../images/2nd/bu_s_building.gif","../images/2nd/bu_shop.gif","../images/2nd/bu_hotel.gif","../images/2nd/bu_koukoku.gif","../images/2nd/bu_parking.gif","../images/2nd/bu_r_estate.gif","../images/2nd/bu_gift.gif","../images/2nd/bu_ptop.gif");
data2 = new Array("../images/2nd/bu_top_o.gif","../images/2nd/bu_corp_o.gif","../images/2nd/bu_s_building_o.gif","../images/2nd/bu_shop_o.gif","../images/2nd/bu_hotel_o.gif","../images/2nd/bu_koukoku_o.gif","../images/2nd/bu_parking_o.gif","../images/2nd/bu_r_estate_o.gif","../images/2nd/bu_gift_o.gif","../images/2nd/bu_ptop_o.gif");
over = new Array();
for(i=0 ; i<data2.length ; i++){
over[i] = new Image();
over[i].src = data2[i];
}

function overimg(num){
document.images["button"+num].src = over[num].src;
}

function outimg(num){
document.images["button"+num].src = data[num];
}