var banner = new Array();

banner[0]='https://i1222.photobucket.com/albums/dd488/andreeeeeei/coedbrazil_soomi.png';
banner[1]='https://i1222.photobucket.com/albums/dd488/andreeeeeei/coedbrazil_noori.png';
banner[2]='https://i1222.photobucket.com/albums/dd488/andreeeeeei/coedbrazil_hyewon-1.png';
banner[3]='https://i1222.photobucket.com/albums/dd488/andreeeeeei/coedbrazil_eunkyo.png';

document.getElementById('pun-logo').firstChild.src= banner[Math.floor(Math.random()*banner.length)];