How can i switch language with some logic

Hey guys,

After some searching, i need your help!

Here is the situation.

The site default language is 'en', and the browser language is 'it'.

When i first access the site, the language should be from browser('it'). And if i click 'English' in language switcher, i need to show the page in 'en'. This is what i want.

Now the problem is that when you click 'English' in language switcher, it continue using the 'it'(from browser), this is not what i want.

I could not tell the difference between 'user writes the url in url bar' and 'user clicks language switcher'. Is there anyone met the same problem?

Since you know that the url 'http://localhost/appName' is the same with the 'en' link: 'http://localhost/appName', they both don't have language code in them.

So i need to know if there is a way to do some operation after the link in language switcher clicked. So that i can handle this problem, but i couldn't find the way.

Any suggestions appreciated! Tks

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_{Edited by WorldFallz - nothing to do with module development, moved to appropriate forum.}