Ok, 
if you goto www.dugnet.net/oper.php 
it will take you back to the main www.dugnet.net website because of the if ($request) { 
do_stuff;
}
require("index.html"); //this should take you back because their was no //request

OK now if we do this www.dugnet.net/oper.php/
it take us back but no images load also note how all the links now have
www.dugnet.net/oper.php/newlink.html
instead of just newlink.html. 
Anyone have an idea on how to fix this and why it does this?
I have checked other sites including www.php.net/projects.php/......./ then click the source button on top right it has projects.php/....../ at the end
You may use www.dugnet.net to see this work. My site is really bad though other ones not so bad that i checked.