Pagination problem

[eluser]caperquy[/eluser]
In some of my views I have a need to post informations, so I will return something like this
http://127.0.0.1/MyApplication/index.php...ion//51/10
where 51 and 10 are my own return values.

I have defined
$config['uri_segment']=3;
Whatever I do the instruction
$offset = $this->uri->segment($uri_segment)
returns 51 as the offset so nothing works.
I will appreciate if someone can tell me what I do wrong. Thanks in advance.