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<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script type="text/javascript">
    var jQueryTemp = jQuery.noConflict(true);
    var jQueryOriginal = jQuery || jQueryTemp;
    if (window.jQuery){
        console.log('Original jQuery: ', jQuery.fn.jquery);
        console.log('Second jQuery: ', jQueryTemp.fn.jquery);
    }
    window.jQuery = window.$ = jQueryTemp;
</script>
<script type="text/javascript">
    console.log('Script using second: ', jQuery.fn.jquery);
</script>
<script type="text/javascript">
    // Restore original jQuery:
    window.jQuery = window.$ = jQueryOriginal;
    console.log('Script using original or the only version: ', jQuery.fn.jquery);
</script>