flying characters

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Hi,

I just prepared my site with c5. Quite some info on the site would be in Greek. There is no problem with Greek characters, only with the flying characters (accent on a char), which is equally part of the Greek language. These are not recognized and a ? appears on the screen instead. This makes it extremely difficult to copy and paste info, as with the question marks, the whole text is not readable. Is there any solution to this?

My site:http://www.terpsichori.org
An example of what I am talking about:http://www.terpsichori.org/Concrete_old/index.php/examples/sitemap/...

Thanks,