try using $dir = "./start"
when you ref a directory in unix, there are certain ways of getting there - if you are passing an absolute pathname, start it with a /
eg /var/www/html/kyrkan-devel/admfile.php
this starts from the root
If you are referencing relative to your current working directory (CWD) use a ./
eg ./start
hope that helps
adam
ps you may also need a trailing slash / at the end