Change language in config.php dynamic [RESOLVED]

[eluser]ELRafael[/eluser]
allright, but the problem is:

i have the string inside the config.php (the main config file). i didn't create a custom config file, or my own file. just changed the original, the main, the genesis one!

system/application/config/config.php. So i think that i don't need to load this, right?

In fact, what i wish is:

The user clicks in link that changes the language of site. And all the language strings are inside another file.

As flicker (the dolphin?) told, the system doesn't react when i wanna change the $config['language'] in runtime.