var banner = new Array();

banner[0]='http://img45.xooimage.com/files/e/b/4/cap-1c029b0.png';
banner[1]='http://img41.xooimage.com/files/2/2/b/cap2-1c029be.png';
banner[2]='http://img41.xooimage.com/files/e/f/3/cap3-1c029d1.png';
banner[3]='http://img47.xooimage.com/files/6/3/c/cap4-1c029d5.png';
banner[4]='http://img49.xooimage.com/files/7/2/b/cap5-1c029e1.png';
banner[5]='http://img47.xooimage.com/files/e/d/7/cap6-1c02a06.png';

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

setInterval("document.getElementById('logo').firstChild.src= banner[Math.floor(Math.random()*banner.length)];",3000);