scrollFix jQuery plugin creates a "Stay on Top" menu and animated scroll to anchor navigation into the page

demo: http://work.lucasaquiles.com.br/scrollFixedMenu/

<script type="text/javascript">
        $(document).ready(function(){
                $("#fixed").scrollFixedMenu({
                        minHeight:100 // min height to scroll and show/hide fixed menu
                });
        })
</script>