AMSTERDAM.- PAN Amsterdam is twenty-five years old and a celebration for every art lover. This fair of today for art, antiques and design presents a fascinating cross-section of what the trade currently has to offer and is an important indicator of the mood of the art market. One hundred and twenty-five art dealers, antique dealers and gallery owners will be showing a fascinating variety of old, modern and contemporary art in an inspiring settingfrom Jan Steen and Studio Job to a Roman statue of the Greek god PAN and top photography by Schilte & Portielje. PAN Amsterdam runs from 20 to 27 November in the Parkhal of the Amsterdam RAI. Most appropriately Mieke Zilverberg will be showing a Roman statue of the Greek god Pan on her stand. The marble statue is considerably older than the fairby a cool 2,000 years. The statue of Pan is identifiable by the hairy goats feet and the pan pipes, named