Here’s the code from Varvy:

<script type="text message/javascript">
function downloadJSAtOnload()
var component = document.createElement("script");
component.src = "deferJS.js";
document.body.appendChild(component);

if (window.addEventListener)
windows.addEventListener("load", downloadJSAtOnload, false);
else if (windowpane.attachEvent)
window.attachEvent("onload", downloadJSAtOnload);
else window.onload = downloadJSAtOnload;
</script>