Scrollbar Annotation animation at 100

A quick and dirty scrollbar annotation like in Path for iPhone. based on: http://jsfiddle.net/michaelhue/7NAvm/7/light/

by lovromar

HTML

<div id="scrollbubble"></div>
<div id="bye">
    <img src="http://gifs.gifbin.com/072009/1246883685_slingshot_prank.gif" /><span class="msg1">Ooooh, its too late, bye!</span><span class="msg2">Have a nice day !</span>

</div>
<div style="height: 2000px">
    <p>Scroll
        <br />down
        <br />↓ ↓ ↓</p>
    <p class="scup">Scroll
        <br />up and
        <br />save a consultant</p>
</div>

CSS

@import url(http://fonts.googleapis.com/css?family=Questrial);
 body {
    font: 12px/1.5 Questrial, Helvetica, sans-serif;
    position:relative;
}
p {
    margin-right: 30px;
    /* text-transform: uppercase;*/
    text-align: right;
    font-size: 70px;
    font-weight: bold;
    line-height: 1;
    color: rgb(200, 200, 200);
}
p.scup {
    position: absolute;
    bottom: 250px;
    right:30px;
}
#scrollbubble {
    display: none;
    position: fixed;
    top: 0;
    right: 20px;
    z-index: 500;
    padding: 3px 8px;
    background-color: #000;
    color: #FFF;
    border-radius: 3px;
}
#scrollbubble:after {
    content:" ";
    position: absolute;
    top: 50%;
    right: -8px;
    height: 0;
    width: 0;
    margin-top: -4px;
    border: 4px solid transparent;
    border-left-color: #000;
}
#bye {
    padding: 5px 4%;
    background: #000;
    color: #fff;
    position: fixed;
    bottom: -240px;
    right: 5px;
    height:230px;
    width:92%;
    text-align:right;
    /* display: none;*/
    font-size:16px;
}
#bye span {
    display:block;
    padding:10px 0;
}
#bye img {
    width:397px;
    float:left;
    opacity:0;
}
#bye span.msg1 {
    font-size:22px;
    opacity:0;
}
#bye span.msg2 {
    font-size:30px;
    opacity:0;
}

JavaScript

var scrollTimer = null;

$(window).scroll(function () {
    var viewportHeight = $(this).height(),
        scrollbarHeight = viewportHeight / $(document).height() * viewportHeight,
        progress = $(this).scrollTop() / ($(document).height() - viewportHeight),
        distance = progress * (viewportHeight - scrollbarHeight) + scrollbarHeight / 2 - $('#scrollbubble').height() / 2;

    $('#scrollbubble')
        .css('top', distance)
        .text('ECDC Consultant Ejection Progress (' + Math.round(progress * 100) + '%)')
        .fadeIn(100);


    //alert(progress);    
    /*  if($(window).scrollTop() == ($('body').height() - $(window).height()))*/
    if (progress >= 0.99) {
        //alert('fufu');
        $('div#bye').animate({
            bottom: '0'
        }, 88),
        $('div#bye > img').animate({
            opacity: '1'
        }, 2000, function () {
            $('div#bye > span.msg1').animate({
                opacity: '1'
            }, 1000,

            function () {
                $('div#bye > span.msg2').animate({
                    opacity: '1'
                }, 1000);
                return false;
            });
        });
    } else {
        $('div#bye').animate({
            bottom: -240
        }, 88),
        $('div#bye > span.msg1').css('opacity', '0');
        $('div#bye > span.msg2').css('opacity', '0');
        $('div#bye > img').css('opacity', '0');
        return false;
    }




    // Fade out the annotation after 1 second of no scrolling.
    if (scrollTimer !== null) {
        clearTimeout(scrollTimer);
    }
    scrollTimer = setTimeout(function () {
        $('#scrollbubble').fadeOut();
    }, 5000);
});