Bootstrap collapse: Change display of icons and text

I have a button set up to expand and collapse content. I want the button to change, based on whether the content is expanded or collapsed. I have the "More Info/Less Info" button working, but the nav hamburger icon changes when the "More Info" button is clicked. How do change one button without changing them all?

by ian_smithz

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.min.css">
<div class="wrapper">
<div class="navbar navbar-inverse ">
    <div class="container">
        <div class="navbar-header">
            <button type="button" id="hamburger" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button> <a class="navbar-brand" href="#">Bootstrap 3.0 Skeleton</a>

        </div>
        <div class="collapse navbar-collapse">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">Home</a>
                </li>
                <li><a href="#about">About</a>
                </li>
                <li><a href="#contact">Contact</a>
                </li>
            </ul>
        </div>
        <!--/.nav-collapse -->
    </div>
</div>




<!-- Collapse section -->
    <h4> Click the button to see more info </h4>
<div id="about" class="collapse" >
As we got further and further away, it [the Earth] diminished in size. Finally it shrank to the size of a marble, the most beautiful you can imagine. That beautiful, warm, living object looked so fragile, so delicate, that if you touched it with a finger it would crumble and fall apart. Seeing this has to change a man.         
</div>

<button type="button" id="more" class="btn visible-xs" data-toggle="collapse" data-target="#about">
<span class="glyphicon glyphicon-chevron-down"></span> More Info
</button>
</div>

CSS

.wrapper {
    width:90%;
    margin-right: auto;
    margin-left: auto;
}

JavaScript

$('#more').click(function () {
if($('button span').hasClass('glyphicon-chevron-down'))
{
    $('#more').html('<span class="glyphicon glyphicon-chevron-up"></span> Less Info'); 
}
else
{      
    $('#more').html('<span class="glyphicon glyphicon-chevron-down"></span> More Info'); 
}
});