jInvertScroll allows for horizontal scrolling and supports parallax.
Here's an article on how to create horizontal parallax scrolling with jInvertScroll
Just use different values for horizon and middle scroll
<!-- language: lang-html -->
<div class="horizon scroll">
<img src="http://i.imgur.com/IImTBHM.png" alt="Background" />
</div>
<div class="middle scroll">
<img src="http://i.imgur.com/e2pwKbv.png" alt="Clouds and Baloons" />
</div>
Here's a demo in stack snippets:
Note: Try viewing in full page
<!-- begin snippet: js hide: false -->
<!-- language: lang-js -->
(function($) {
$.jInvertScroll(['.scroll']);
}(jQuery));
<!-- language: lang-css -->
html, body {
padding: 0;
margin: 0;
font-family:'Open Sans', sans-serif;
font-weight: 300;
font-size: 16px;
color: #555;
background: #9fdefd;
}
h1, h2 {
color: #238acb;
}
.horizon {
line-height: 0;
z-index: 100;
width: 3000px;
}
.middle {
line-height: 0;
z-index: 250;
width: 4500px;
}
.front {
z-index: 500;
top: 150px;
width: 6000px;
}
.intro {
position: absolute;
left: 500px;
top: 0px;
padding-right: 50px;
background: url('http://i.imgur.com/3woqwh2.png') no-repeat right 5px;
}
.page {
position: absolute;
top: 0px;
width: 500px;
background: white;
padding: 10px 30px;
border: 1px #eee solid;
}
.panel1 {
left: 1500px;
}
.panel2 {
left: 2575px;
}
.panel3 {
left: 3800px;
}
.panel4 {
left: 5100px;
}
<!-- language: lang-html -->
<link href="http://www.pixxelfactory.net/jInvertScroll/css/jInvertScroll.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="http://www.pixxelfactory.net/jInvertScroll/js/jquery.jInvertScroll.js"></script>
<div class="container">
<div class="horizon scroll">
<img src="http://i.imgur.com/IImTBHM.png" alt="Background" />
</div>
<div class="middle scroll">
<img src="http://i.imgur.com/e2pwKbv.png" alt="Clouds and Baloons" />
</div>
<div class="front scroll">
<h1 class="intro">Scroll down</h1>
<div class="panel1 page">
<h2>The Hot Air Balloon</h2>
</div>
<div class="panel2 page">
<h2>How they work</h2>
</div>
<div class="panel3 page">
<h2>Practicalities</h2>
</div>
<div class="panel4 page">
<h2>Section 4</h2>
</div>
</div>
</div>
<!-- end snippet -->