Move a code ignitir site to another domain

[eluser]Unknown[/eluser]
Hi, I'm usually a Zend Framework user but now I have the job of moving a Code Igniter site from a domain to another. Of the first domain i only have the FTP access so I can't see if any sort of redirection is actived or something else. When I try to run it in localhost or on the other domain it works only if I add manually "index.php" into the URL but on the current domain it works without adding it.
Can you help me with this "simple" task?
thanks