non blocking js load

gistfile1.js

(function(){
function isFileReady ( readyState ) {
    // Check to see if any of the ways a file can be ready are available as properties on the file's element
    return ( ! readyState || readyState == 'loaded' || readyState == 'complete' );
  }	
	
	
var p = document.getElementsByTagName('script'),
	p = p[p.length-1]; 
		
window.loadJS = function(src, callback){
	var s = document.createElement('script'),
		done;
	s.onreadystatechange = s.onload = function () {

	  if ( ! done && isFileReady( s.readyState ) ) {

		// Set done to prevent this function from being called twice.
		done = true;
		callback();

		// Handle memory leak in IE
		s.onload = s.onreadystatechange = null;
	  }
	};
	s.src = src;
	p.parentNode.insertBefore(s, p);
};
})();


(function(){
	var cbs = [];
	var jqLoaded = function(){
		while (cbs.length){
			cbs.pop()();
		}
	};
	window.jqready = function(cb){
		if (window.jQuery){
			cb();
		} else {
			cbs.push(cb);
		}
	};
	loadJS('http://yandex.st/jquery/1.7.1/jquery.min.js', function(){
		if (!window.jQuery){
			loadJS('https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js', function(){
				if (!window.jQuery){
					loadJS('/js/jquery.js', function(){
						if (window.jQuery){
							jqLoaded();
						} else {
							console.log("ugly world, can't load jquery")
						}
					})
				} else {
					jqLoaded();
				}
			})
		} else {
			jqLoaded();
		}
	})
		
})();



jqready(function(){
	$(function(){
		$(document.body).append('<p>crazy shi</p>')
	})
})