Thanks for your answer! Yet still I have some problems.
I've replaced the dynamic-locale.php file from my gallery with the one from the nightly build (06.06.2010). The browser still forgets the language.
How should I append to a link the language selector. Which is the syntax?
Does it remain displayed in the url when the user moves to another page? That would be lovely for google...
Maybe I should mention my intetions

. I figured out how to use dynamic-locale to translate the whole site, and I'd like to make 3 translations: romanian, english and french. I guess if I put a dynamically generated link in the header, say: "read english translation" with the href attribute appended with the coresponding language selector, that should be enough for google to be able to index diferent translations with diferent url's. I quess it works even if the link loses the lang selector while browsing leaving the browser to relly on the cookies for the right translation. I think so because every page would have a link to it's translation giving googlebot links to all translated pages in all 3 languages.
Sry if I'm posting questions from other topics. I tried to search the forum for some answers but I'm still confused.
Waiting for your suggestions. Thanks!