bookmarklet to inject jQuery into any page

jQuery-bookmarklet.js

(function() {
	if(typeof jQuery!='undefined') {
		return console.log('jQuery already present: v'+jQuery.fn.jquery);
	}
	if(typeof($) === 'function') {
		console.log('$ already defined. Use $jq(), not $().');
	}
	var script=document.createElement('script');
	script.src='http://code.jquery.com/jquery-latest.min.js';
	var head=document.getElementsByTagName('head')[0],
	done=false;
	script.onload=script.onreadystatechange = function(){
		if ( !done && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete') ) {
			done=true;
			if (typeof jQuery=='undefined') {
				console.log('jQuery not loaded');
			} else {
				console.log('jQuery loaded: v' + jQuery.fn.jquery);
			}
			script.onload = script.onreadystatechange = null;
			head.removeChild(script);
		}
	};
	head.appendChild(script);
})();