using functions.php (theme functions)

I put this in functions.php:

function superslide_load() {
		$tdir = 'superheader';
		$dh  = opendir($tdir);
		while (false !== ($filename = readdir($dh))) {
		    $files[] = $filename;
		}

	        //$dirs = scandir($tdir);
	        foreach($files as $file) {
	                if (($file == '.')||($file == '..'))
	                {
	                }
	                elseif (is_dir($tdir.'/'.$file))
	                {
	                        filesInDir($tdir.'/'.$file);
	                }
	                else
	                {
	                      echo  '<div><img src="'. $tdir.'/'.$file.'"/></div>';
	                }
	        }
	}

I tried calling it (within php tags, in the body of the page.php template) with:

superslide_load() and also tried:
<?php if ( function_exists( 'superslide_load' ) ) superslide_load(); ?>

then I added:
add_action('wp_head', 'superslide_load');
to the functions.php (right after the function closed) and tried calling it this way:
<?php do_action( 'superslide_load', '' ); ?>

No luck! No errors! Just nothing. Weird because I had this working in MAMP locally (the first sample, above), but can’t make it work on the public server.

Any clues? Thanks!