How to defer Javascripts.

Add the following small code (created by Google Page Speed experts) to the bottom of your page just above the closing </body> tag:

<script type="text/javascript">
function downloadJSAtOnload() {
var element = document.createElement("script");
element.src = "yourdeferscripts.js";
document.body.appendChild(element);
}
if (window.addEventListener)
window.addEventListener("load", downloadJSAtOnload, false);
else if (window.attachEvent)
window.attachEvent("onload", downloadJSAtOnload);
else window.onload = downloadJSAtOnload;
</script>

Replace yourdeferscripts.js with the .js file you created in the step before this one. By using the above scripts on your page you tell the browser to load the yourdeferscripts.js file after your page has finished loading.