create iframe in div for widgets like twitter or facebook

<div id="ad54"></div>

window.onload = function(){

var link = "http://www.google.com"
var iframe = document.createElement('iframe');
iframe.frameBorder=0;
iframe.width="300px";
iframe.height="250px";
iframe.id="randomid";
iframe.setAttribute("src", link);
document.getElementById("ad54").appendChild(iframe);
}

taken from this answer
http://stackoverflow.com/questions/10302109/create-iframe-with-javascript-appending-to-a-div