Run the command in your console to see the current jQuery version. Wait for a while because the new source file may take a while to load.
<br>
Command: $.fn.jquery
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script>
    var all = document.querySelectorAll('script[src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"]'),
    script;
    for(var i=0, len = all.length; i < len; i++){
        script = document.createElement('script');
        script.src = "http://code.jquery.com/jquery-1.7.1.js";
        all[i].parentNode.removeChild(all[i]);
        document.body.appendChild(script);
    }
</script>