modify PHP array for switching out header images

Hi guys I currently have this array, which I had help writing, which switches out the header images for several different categories.

Now, I need a custom header image for a page instead of a category. It’s just one right now, but it will probably be more later, so I’m thinking I should keep the array format?

Anyway, here’s the code I currently have and I’d be making

‘shop-2’ => ‘headercat14’

This code is contained within the header.php file:

<?php
$c = get_query_var('cat');
$cat = get_category ($c);

$headers = array(
    'americans-want-peace' => 'headercat01',
    'all-nations-want-peace' => 'headercat02',
    'all-religions-want-peace' => 'headercat03',
    'all-people-want-peace' => 'headercat04',
    'military-america' => 'headercat05',
    'worldwide-warfare' => 'headercat06',
    'persecuting-peacemakers' => 'headercat07',
    'glorifying-war-with-mass-media' => 'headercat08',
    'non-violence-works' => 'headercat09',
    'war-wrecks-usa-economy' => 'headercat10',
	'united-peace-and-green-movements' => 'headercat11',
	'save-the-children-social-justice' => 'headercat12',
	'peace' => 'headercat13',
	'shop-2' => 'headercat14'
);

$divid = isset($headers[$cat->slug]) ? $headers[$cat->slug] : 'header';

?>