Loading and Unloading iframes with javascript

While working on miLock Pro I was looking for a way to load and unload iframes. 

Heres what I came up with.

  <script>

  

     function createTwitter()

             {

            iframe = document.createElement("iframe"); //create iframe

            iframe.id = "widget5"//name

            iframe.src="Widget/Twitter/LockBackground.html"; //location

            iframe.style.backgroundColor = "transparent"; //transbg

            iframe.frameBorder = "0"; //no border

            iframe.allowTransparency="true"; //allow trans

            d = document.getElementById("twitter"); //grab div to connect to iframe

            d.appendChild(iframe); //connect

            iframe = null;

            d = null;

        }

function removeIframe()

        {

            tweet = document.getElementById("widget5");

            tweet.src=""; //clear

            tweet = null; //clear

            var d = document.getElementById("twitter");

            d.removeChild(document.getElementById("widget5"));

        }

  </script>

Then call each function with either createTwitter() or removeIframe()

Not much to it really. Strange for the lack of documentation for this. Hope this helps someone.