Request for Comments on two column Micro File Manager from n00b

code review request

A couple of days ago, I was dismayed to find my ~/public_html directory
choked with junk files. I wanted a micro file manager to be able to
parse the files and directories quickly and it seems like php is the
answer.

I found a public domain script on www.phptoys.com called
microFileManager.php that I based the following code. The original code
used tables. The code below uses a style sheet and presents the
directory listing in column 1 and the selected file content in column 2
in a basic menu/content 2 column format.

Sample style sheet provided.

I'm new to php and would appreciate feedback on this script. Layout,
function calls, error handling - whatever. Perhaps there are php classes
or functions that can do this better.

The micro file manager requirements are...

o create a well written php script

o not to exceed 100 lines of code

o wrapping at column 80 - personal preference - posting to
newsgroup would make this requirement difficult at best -
so perhaps this should read - readable code.

o directory listings displayed on left column

o selecting item in listing displays item in right column

o two files only, the script and the stylesheet. No extra
gifs, functions, features.

o no tables

CODE:

function showHeader($path) {
print "

";
print "

$fn

";
$imageext = array(jpg, jpeg, JPEG, JPG, gif, png);
$textext = array(txt, cfg, sql, css, plugin);
$path_parts = pathinfo($fn);
if (in_array($path_parts['extension'], $imageext, true)) {
echo '';
} elseif (in_array($path_parts['extension'], $textext, true)) {
echo '

';

                include("$path/$fn");

                echo '

';
} else {
include("$path/$fn");
}
print "