generell PHP script installing problem like phATM; HELP PLEASE :-)

[xfan]

hallo,

i've try some php scripts on my uni account, but most scripts i've
wanted to install have big problems with include. so i get mostly
"Fatal error: Call to undefined function:..." . it seems to be a
problem of me, because other scripts of other people running.
for example i've now installed phpatm, a small file transfer script.
all files have 775 chmod-rights, so every body can read and execute.

may be you try: http://www.inf.tu-dresden.de/~s2713090/to see my
problem
for testing i've put phpinfo() in
http://www.inf.tu-dresden.de/~s2713090/testphp.php

in the conf.php is follow written and i think, thats the point of my
errors, because i'm not sure, which domain and path-name ich have to
take:

//
// URL link to homepage (the link under "home" icon).
// These value will not influence the script working
//
$homeurl = "http://www.inf.tu-dresden.de/~2713090";
//
// $domain_name: the domain of your site without trailing 'http://'
(eg. www.mysite.net)
// $script_folder_path: the path where phpATM is located relative to
the domain name
//
$domain_name = 'www.inf.tu-dresden.de';
$script_folder_path = '~s2713090/';
$installurl = 'http://' . $domain_name . '/' . $script_folder_path;