How to make a window pop up to choose language?

[my add]

Hi there.
I have two blogs.
They both have exactly the same topic but in two different languages.
the one that finishes in dot com is in Portuguese and the one that finishes in dot co dot uk is in English.
My question is:
Is there anyway to make a window pop up or a page pop up asking to choose the language when people visit my website?
I want the window to pop up in both blogs and depending on the language they choose, the link will direct them to the right version.

I was able to do this with the current template from another provider, however I want to change to one I saw in here but I would like to know if there is a way to do it.

Please let me know as soon as possible.

Thank you very much

[Author]

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