jQuery 1.90 & 2.0.0

<!--[if lte IE 8]>
    <script src="jquery1.9.0.js"></script>
<![endif]-->

<script>
    if (!jQuery) {
        var js = document.createElement('script');
        js.src = 'jquery2.0.0.js';
        var first = document.getElementsByTagName('script')[0];
        first.parentNode.insertBefore(js, first);
    }
</script>