Fixed Position / Cover Image Fix (Src: http://goo.gl/0wkXIk)

fixed-pos-cover.html

<div id="wrapper">
    <div id="container"></div>
    <p>Scroll Down</p>    
</div>
<div id="content">
</div>

script.js

$(window).scroll(function() {
  var scrolledY = $(window).scrollTop();
  $('#container').css('background-position', 'left ' + ((scrolledY)) + 'px');
});

style.css

#wrapper {
    background: #bada55;
    width:100%;
    height: 400px;
}
#container {
    background-image:url("http://farm3.staticflickr.com/2533/4062253262_90a3635234_o.jpg");
    background-attachment:scroll;
    background position:left top;
    background-size:cover;
    width:100%;
    height:300px;
}

#content {
    height:2000px;
}

p {
    line-height:1.5;
    font-family:sans-serif;
    font-size:3.875em;
    margin: 0 0 20px;
    text-align:center;
    color:#fff;
}