JavaScript: Parallax Background

JavaScript: Parallax Background.js

// Parallax

$(document).ready(function(){
    $window = $(window);
    var width = $window.width();
    $(window).scroll(function() {
        // #header
        var offset = 0;
        var speed = 3;
        var calc = ($window.scrollTop() / speed) + offset;
        var results = '50% '+ calc + 'px';
        $('#header').css({ backgroundPosition: results });
    });
});