Code Review - Where will this .positionTop() function fail?

http://codereview.stackexchange.com/q/7785/9137

HTML

<!DOCTYPE html>
<html>
    
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>AeroFS API Reference</title>
        <link rel="shortcut icon" href="img/favicon.ico">
        <link rel="stylesheet" href="css/bootstrap.css">
        <link rel="stylesheet" href="css/google-open-sans.css">
        <link rel="stylesheet" href="css/aerofs.css">
        <link rel="stylesheet" href="css/syntax.css">
        <link rel="stylesheet" href="css/api.css">
    </head>
    
    <body data-spy="scroll" data-target="#left-nav" data-offset="800">
        <div id="wrapper">
            <div class="container-fluid" id="top-container">
                <div class="row-fluid">
                    <div class="span12" id="top-nav-span">
                        <ul class="nav nav-pills top-nav">
                            <li><a href="https://www.aerofs.com">
                                <img src="img/logo_small.png"
                                     width="144" height="40" alt="AeroFS"/>
                            </a>

                            </li>
                            <li class="pull-right"> <a class="btn" id="nav-btn-sign-up" href="https://www.aerofs.com/private-cloud-signup">
                                    Sign up for Private Cloud</a>

                            </li>
                            <li class="pull-right"><a href="https://www.aerofs.com/developers">
                                Documentation
                            </a>

                            </li>
                        </ul>
                    </div>
                </div>
            </div>
            <div class="container-fluid" style="padding-right: 0">
                <div class="row-fluid">
                    <div id="left-nav" data-spy="affix" data-offset-top="60">
                        <ul id="left-nav-list" class="nav nav-list">
                            <li class="nav-node"><a...

JavaScript

$(document).ready(adjustLeftNavHeight);
$(window).resize(adjustLeftNavHeight);

// adjust the height of the left navigation panel according to the height of
// the browser
function adjustLeftNavHeight() {
    $('#left-nav').css({
        'height': $(window).height() - 82,
            'overflow': 'scroll'
    });
}

$(document).ready(function () {
    var nav = $('#left-nav');
    // ensures activated item is in view 
    $('#left-nav-list').on('activate', '.nav-node, .nav-subnode', function () {
        nav.scrollTop(inRange(nav.scrollTop(),
        this.offsetTop + this.offsetHeight - nav.height(),
        this.offsetTop));
    });
});

// returns val bounded by [atLeast, atMost] 
function inRange(val, atLeast, atMost) {
    return Math.min(Math.max(val, atLeast), atMost);
}