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Сообщение от dolte
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чтобы она не наползала на футер (футер высокий)
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Вариант ...
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>demo</title>
<script src="https://code.jquery.com/jquery-1.9.1.js"></script>
<style type='text/css'>
body{padding:0px;margin:0px}
*{margin:0}
html,body{height:1000px}
.wrapper{min-height:100%;height: auto !important;height:100%;margin:0 auto -170px}
.footer,.push{height:170px}
.footer{background:#F00}
#scroll{background:#008000;height:50px;width:50px;position:fixed;right:0px;bottom:40px;display:none}
</style>
<script type='text/javascript'>
$(function(){
var up = $("#scroll"),
b = up.css("bottom"),
h = up.height(),
d = $(".footer").offset();
$(document)
.scroll(function () {
var c = $(window)
.height(),
a = $(this)
.scrollTop();
200 < a ? up.fadeIn() : up.fadeOut();
d.top > a + c - h ? up.css({
background: "red",
bottom: b
}) : up.css({
background: "green",
bottom: a + c - d.top
})
});
up.click(function () {$('body,html').animate({scrollTop: 0}, 400); return false;});
});
</script>
</head>
<body>
<div id="scroll"></div>
<div class="wrapper">
<p>Your website content here.</p>
<div class="push"></div>
</div>
<div class="footer">
<p>Copyright (c) 2013</p>
</div>
</body>
</html>