Conditionally Load jQuery

conditionally-load-jquery.js

//Conditionally load jQuery
//inspired by http://www.smashingmagazine.com/2010/05/23/make-your-own-bookmarklets-with-jquery/

function myOnLoadEvent() { 		
	jQuery(document).ready(function($) { 
		alert('your code here');

	});
}

function load_jQuery_conditionaly() {
    if (typeof jQuery == 'undefined') {
	var jQ = document.createElement('script');
	jQ.type = 'text/javascript';
	jQ.onload = jQ.onreadystatechange = myOnLoadEvent;
        //use protocol relative url
	jQ.src = '//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js';
	document.body.appendChild(jQ);
    }
    else { 
        myOnLoadEvent();
    }
};

//http://stackoverflow.com/questions/9434/how-do-i-add-an-additional-window-onload-event-in-javascript/688199#688199
if (window.addEventListener) // W3C standard
{
  window.addEventListener('load', load_jQuery_conditionaly, false); // NB **not** 'onload'
} 
else if (window.attachEvent) // Microsoft
{
  window.attachEvent('onload', load_jQuery_conditionaly);
}