REVISED: sorry
I believe what you are looking for is here:
includes/languages/english/product_info.php
Line #15 : define('TEXT_PRODUCT_OPTIONS', 'Please Choose: ');
Line #164 : define('TEXT_PRODUCT_OPTIONS', '<strong>Please Choose:</strong>');
If you search for 'TEXT_PRODUCT_OPTIONS' in the Tools->Developers Toolkit you will find a few references to the 'TEXT_PRODUCT OPTIONS' variable.
You wouldn't happen to know anything about formatting the table the attribute images appear in, would you? Anyone?
Thx



