var banner = new Array();

banner[0]='https://i1072.photobucket.com/albums/w369/Lord0eske/banner3_zpsf60f1c8e.png';
banner[1]='https://i1072.photobucket.com/albums/w369/Lord0eske/banner1_zps541e35e6.png';
banner[2]='https://i1072.photobucket.com/albums/w369/Lord0eske/banner2_zpsc5f92cf2.png';
banner[3]='https://i1072.photobucket.com/albums/w369/Lord0eske/banner4_zps0f58ada3.png';

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