$(document).ready(
    function() {
        $('#dock').Fisheye( {
                maxWidth: 50,
                items: 'a',
                itemsText: 'span',
                container: '.dock-container',
                itemWidth: 40,
                proximity: 90,
                halign : 'center'
            }
        )

        $('#backButton').click(function() {
            javascript:history.back();
        });
    }

);