var banner = new Array();

banner[00]='http://i.imgur.com/vJf2g.png';
banner[01]='http://i39.tinypic.com/wwkrbq.png';
banner[02]='http://i42.tinypic.com/2ym6tk0.png';
banner[03]='http://i41.tinypic.com/espzt3.png';
banner[04]='http://i.imgur.com/zpWYY.png';
banner[05]='http://i40.tinypic.com/f5dcuc.png';
banner[06]='http://i43.tinypic.com/67s4z7.png';
banner[07]='http://i42.tinypic.com/do71mr.png';
banner[08]='http://i41.tinypic.com/10prqeo.png';
banner[09]='http://i42.tinypic.com/ixgu1g.png';
banner[10]='http://i41.tinypic.com/34tbime.png';
banner[11]='http://img12.imageshack.us/img12/1015/bannerpokeshiny.png';
banner[12]='http://i42.tinypic.com/rvk60x.png';
banner[13]='http://i.imgur.com/vrcwE.jpg';
banner[14]='http://i.imgur.com/1tNVN.png';
banner[15]='http://i.imgur.com/76P2N.png';
banner[16]='http://i.imgur.com/fsfpX.png';
banner[17]='http://1.bp.blogspot.com/-WXXq2hSkrgo/Tsp1JpbCAkI/AAAAAAAAAXQ/kYU_HJfB7Gs/s1600/banner-2.0.png';

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