Reading files from a directory

I have problem with reading files from directory. This is the code: <? $Handle = opendir('/www/publico2/docs/map'); while ($file = readdir($Handle)) { print "$file<br>\n"; }; ?> That is ALL code on a script file. These are the file in directory: . .. array_maker.php4 map.php4 renamer.php4 border_bl.gif border_bm.gif border_br.gif border_ml.gif border_mr.gif border_ul.gif border_um.gif border_ur.gif grid.gif map_config.php4 map_dot.php4 handle.php4 map_dot.gif core md_998634933_071758800998634933.gif md_998634937_060465500998634937.gif md_998634941_025996400998634941.gif If I have more than five of the files named like "md_123456789_12345.....gif" page returns Internal Server Error (500). What can cause this? Is there a solution? Niklas