test

HTML

look at browser console

JavaScript

function loadScript(variable_name, script_url) {
    var script = document.createElement("script");
    script.setAttribute("type", "text/javascript");
    script.setAttribute("src", script_url);
    script.onload = function() {
        if (variable_name != undefined) {
            window[variable_name] = jQuery.noConflict(true);
            console.log("after attach: " + window[variable_name].fn.jquery);
        }
    };
    (document.getElementsByTagName("head")[0] || document.documentElement).appendChild(script);
};

loadScript('newjQuery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js');
loadScript('$', 'http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js');
//loadScript(undefined, 'http://example.com/some/dependent/script/requiring-1.5.2.js');