var banner = new Array();

banner[1]='https://i.servimg.com/u/f38/14/78/70/63/alpiso10.gif';
banner[2]='http://img687.imageshack.us/img687/8308/trialzz.jpg';
banner[3]='http://img682.imageshack.us/img682/4323/dragp.jpg';
banner[4]='http://img830.imageshack.us/img830/6898/spd0.jpg';
banner[5]='http://img6.imageshack.us/img6/9516/pista0.jpg';
banner[6]='http://img180.imageshack.us/img180/9928/encuentro0.jpg';
banner[7]='http://img822.imageshack.us/img822/4272/110te.jpg';
banner[8]='http://img412.imageshack.us/img412/2694/motogp201.jpg';
banner[9]='http://img687.imageshack.us/img687/5867/waver.jpg';
banner[10]='http://img709.imageshack.us/img709/748/tableroz.jpg';
banner[11]='http://img836.imageshack.us/img836/3484/45270283.jpg';
banner[12]='http://img837.imageshack.us/img837/3219/sq1t.jpg';
banner[13]='http://img841.imageshack.us/img841/5066/sm3a.jpg';
banner[14]='http://img585.imageshack.us/img585/9521/showapt.jpg';


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