var domain = 'http://adrock.rockitsolutions.net/';

var adID = Math.floor(Math.random()*11);
    
// Write section where the ad will be add.
document.write("<div id=\"ads" + adID + "\"></div>");

createlink = document.createElement('a');                        
createlink.href = domain + 'click.aspx?pid=' + 'f9d0fe13';

// Create banner.
var img = document.createElement('img');
img.src = domain + 'pagead/banners/468x60/ads_rjmusic_468x60.jpg';
img.style.borderStyle = 'none';
        
// Add banner into «a» tag.
createlink.appendChild(img); 

// Add banner into «div» tag.
document.getElementById('ads' + adID).appendChild(createlink);