Back To Top

http://www.developerdrive.com/2013/07/using-jquery-to-add-a-dynamic-back-to-top-floating-button-with-smooth-scroll/

------------------------------------------------------------------------------------------------------------

<a href="#" class="back-to-top">Back to Top</a>

<style>

.back-to-top {
    position: fixed;
    bottom: 2em;
    right: 0px;
    text-decoration: none;
    color: #000000;
    background-color: rgba(235, 235, 235, 0.80);
    font-size: 12px;
    padding: 1em;
    display: none;
}

.back-to-top:hover {    
    background-color: rgba(135, 135, 135, 0.50);
}

</style>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js">

<script>

jQuery(document).ready(function() {
    var offset = 220;
    var duration = 500;
    jQuery(window).scroll(function() {
        if (jQuery(this).scrollTop() > offset) {
            jQuery('.back-to-top').fadeIn(duration);
        } else {
            jQuery('.back-to-top').fadeOut(duration);
        }
    });
    
    jQuery('.back-to-top').click(function(event) {
        event.preventDefault();
        jQuery('html, body').animate({scrollTop: 0}, duration);
        return false;
    })
});

</script>