if(document.images) {
 var imgs = new Array();
 imgs[0] = new Image();  imgs[0].src = "../../common/bt_ichiran.gif"; 
 imgs[1] = new Image();  imgs[1].src = "../../common/bt_ichiran2.gif";
 imgs[2] = new Image();  imgs[2].src = "../../common/bt_shitumon.gif"; 
 imgs[3] = new Image();  imgs[3].src = "../../common/bt_shitumon2.gif";
 imgs[4] = new Image();  imgs[4].src = "../../common/bt_nigari.gif";
 imgs[5] = new Image();  imgs[5].src = "../../common/bt_nigari2.gif";
 imgs[6] = new Image();  imgs[6].src = "../../common/bt_okaidoku.gif";
 imgs[7] = new Image();  imgs[7].src = "../../common/bt_okaidoku2.gif";
 imgs[8] = new Image();  imgs[8].src = "../../common/bt_mail.gif";
 imgs[9] = new Image();  imgs[9].src = "../../common/bt_mail2.gif";
 imgs[10] = new Image();  imgs[10].src = "../../common/bt_company.gif"; 
 imgs[11] = new Image();  imgs[11].src = "../../common/bt_company2.gif"; 
}
function rollOver(id, imgname) {
document.images[id].src = imgs[imgname].src;
}