I have just finished a script which automatically translates pages to any desired language via a text file using php.
Then it occured to me, can the Search engines find these pages and their contents.

Basically when the person visits the site, the script looks to see if theres a cookie already placed or a PHP variable, if not then it sets these to the default (English) then includes the text strings in the HTML tags using PHP from the "english" translation file.

If somebody chooses a new language then the variable and cookie are updated and the new language is displayed with the text from the specific translation file.
The cookie is only for remembering the persons previous preference.

My big worry as I have limited knowledge of the Search Engine bots is, will they find the contents to the website and will they find every language text to list in the relevant search engine of that country.

As I have already done a campaign and this site is already No1 in the Greek google search engine for many keywords I dont want to lose this placing by testing the script.

Does anybody have any ideas?