Using Jquery Confilict for using multiple javascript framework

<script src="http://code.jquery.com/jquery-1.5.js"></script>
<script >
jQuery.noConflict();
jQuery("li:first").css("padding-left", "0");
jQuery("li:last").css("background", "none");
</script>
Using above jquery code we use different multiple javascripting framework.
http://api.jquery.com/jQuery.noConflict/