source code:

    /* Copyright 2010 Google Inc. All Rights Reserved. http://tools.google.com/dlpage/gaoptout/intl/en/eula_text.html */
    (function () {
    var a = document.createElement("script");
    a.type = "text/javascript";
    a.innerText =
        'window["_gaUserPrefs"] = { ioo : function() { return true; } }';
        document.documentElement.insertBefore(a, document.documentElement.firstChild);
    })();