var banner = new Array();

banner.push('http://nsa20.casimages.com/img/2010/12/12/101212095608456140.png');
banner.push('http://nsa26.casimages.com/img/2011/02/04/110204110027547109.png');
banner.push('http://nsm05.casimages.com/img/2011/07/25/1107250314021267448513265.png');
banner.push('http://nsm05.casimages.com/img/2011/04/08/1104080255481267447958543.png');
banner.push('http://nsm05.casimages.com/img/2011/04/08/1104080255491267447958544.png');
banner.push('http://nsm05.casimages.com/img/2011/04/08/1104080255491267447958545.png');
banner.push('http://nsm05.casimages.com/img/2011/04/08/1104080255491267447958546.png');
banner.push('http://nsm05.casimages.com/img/2011/04/10/1104100227441267447967254.png');
banner.push('http://nsm05.casimages.com/img/2011/04/10/1104100317141267447967579.png');
banner.push('http://nsm05.casimages.com/img/2011/07/08/1107080510511267448441643.png');
banner.push('http://nsm05.casimages.com/img/2011/08/03/1108030127241267448540584.png');
banner.push('http://nsm05.casimages.com/img/2011/08/03/1108030154081267448540604.png');
banner.push('http://nsm06.casimages.com/img/2011/11/19/1111190910331267449071469.png');

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


setInterval("document.getElementById('i_logo').src= banner[Math.floor(Math.random()*banner.length)];",20000);