Vertical-Paralax/vptest.html at master · BrandExtract/Vertical-Paralax · GitHub

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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Simple Vertical Paralax</title>
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="jquery.ba-throttle-debounce.min.js"></script>
<script>
$(document).ready(function () {
    //hardcoded sizes of top and bottom, matching the css for #top and #bottom
    var topHeight = (2800);
    var bottomHeight = (1200);

    $(window).scroll($.throttle(60, moveMe));
    $(window).resize($.debounce(1000 , moveMe));

    function moveMe() {

	var windowHeight = $(window).height();
        var winPos = $(window).scrollTop();
        var maxScroll = (topHeight - windowHeight);
        var delta = ((windowHeight - bottomHeight));
        var bottomCalculation = ((winPos / maxScroll) * delta);
	//bottomCalculation = (bottomCalculation ) - ((bottomCalculation )*2);
	/*console.log("winPos:"+winPos);
	console.log(winPos+"//"+Math.round(winPos) );
	console.log(bottomCalculation);*/


        $('#bottom').stop().animate({
            top: bottomCalculation
        }, {
            duration: 60,
            specialEasing: {
                top: 'linear'
            }
        });
    };
});
</script>
<style>
body {
text-align:center;
margin-top:0;
margin-bottom:0;
}

#outer {
width:900px;
margin-left:auto;
margin-right:auto;
position:relative;
}

#top {
position:absolute;
z-index:2;
width:100%;
height:2800px;
background-image:url(2800.png);
background-repeat:no-repeat;
}

#bottom {
position:fixed;
z-index:1;
width:100%;
height:1200px;
background-image:url(1200.png);
background-repeat:no-repeat;
background-color:#F3DFA3;
}
</style>
</head>

<body>
    <div id="outer">
        <div id="top"></div>
        <div id="bottom"></div>
    </div>
</body>
</html>