Try changing this line:
Code:
// If no currency is set, use appropriate default
if (!isset($_SESSION['currency']) && !isset($_GET['currency']) ) $_SESSION['currency'] = DEFAULT_CURRENCY;
to this:
Code:
// If no currency is set, use appropriate default
if (!isset($_SESSION['currency']) && !isset($_GET['currency']) ) $_SESSION['currency'] = 'EUR';
And getting rid of the other edit. Probably a better solution.