Dynamically loading jQuery when it's not available or version isn't high enough

I'm writing a script for others to use on their websites. I'd like to use jQuery in this script. Because I don't have control over what frameworks people use on their sites, I need to make sure jQuery is available and that it's version 1.8 or higher. Here's my take on it. Does anyone see anything I could/should be doing differently? Is there a better way of doing this?

//start anon function for whole script
;(function(){
    var $,
        hasOwn = ({}).hasOwnProperty,
        //get ie version returns false if ie>=11 or not ie
        ieVersion = function(){
            var v = 3,
                div = document.createElement('div'),
                all = div.getElementsByTagName('i');
            while(div.innerHTML = '<!--[if gt IE '+(++v)+']><i></i><![endif]-->', all[0]);
            return (v > 4 ? v : ('documentMode' in document ? document.documentMode : false));
        }(),
        //get which version of jQuery is currently added to the site
        jqVersion = function(){
            return 'jQuery' in window && !!window.jQuery ? parseFloat(window.jQuery.fn.jquery) : false;
        },
        //set the correct jquery version to use based on which version of ie is in use. Use an array in the case of one or more being down
        jqSrc = (!!ieVersion && ieVersion > 4 && ieVersion < 9) ? ['//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js', '//cdnjs.cloudflare.com/ajax/libs/jquery/1.11.0/jquery.min.js', '//ajax.aspnetcdn.com/ajax/jQuery/jquery-1.11.0.min.js'] : ['//ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js', '//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.0/jquery.min.js', '//ajax.aspnetcdn.com/ajax/jQuery/jquery-2.1.0.min.js'],
        //check jquery version and if it is above 1.8 use it, if not then get own version
        jqCheck = function(first){
            var version = jqVersion();
            if(!version || version < 1.8){
                getScript(jqSrc.shift(), jqCheck);
            }else{
                if(!!first){
                    $ = window.jQuery;
                }else{
                    $ = window.jQuery.noConflict(true);
                }
                load();
            }
        },
        //function to loop and load jquery script
        getScript = function(url, callback){
            var script = document.createElement('script'),
                tag = document.getElementsByTagName('script')[0],
                done = false;
            script.type = 'text/javascript';
            script.async = !0;
            script.src = url;

            script.onload = script.onreadystatechange = script.onerror = function(){
                if(!done && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete')){
                    done = true;
                    if(typeof(callback) === 'function'){
                        callback.call(this);
                    }
                    script.onload = script.onreadystatechange = script.onerror = null;
                }
            };

            tag.parentNode.insertBefore(script, tag);
        },
        load = function(){
            //Start script
            window.myGlobalFunction = new function(){
                var privateVar = 'private',
                    privateFunc = function(){
                        return true;
                    };

                this.publicVar = 'public';

                this.publicFunc = function(){
                    return true;
                };
            };
        };

    //make sure json is avaiable, if not add it
    if(!hasOwn.call(window, 'JSON') || !hasOwn.call(JSON, 'parse') || (typeof(JSON.parse) !== 'function')){
        getScript('//cdnjs.cloudflare.com/ajax/libs/json3/3.3.1/json3.min.js', function(){
            //all functions are built start by checking for jQuery and it's builder
            jqCheck(true);
        });
    }else{
        //all functions are built start by checking for jQuery and it's builder
        jqCheck(true);
    }
})();