GLOBAL MARKETS-Dollar hits four-year high, hurts equity outlook

* Dollar basket at 4-year high, euro near 2-year low * Wall Street, other markets slide more than 1 pct on dollar * Treasury/Bund gap widest in 15 years, supporting dollar * Brent crude under $97, capped by ample supply (Adds close of European bond, stock markets) By Herbert Lash NEW YORK, Sept 25 (Reuters) - The dollar hit a four-year high as the yield difference between U.S. and German bonds widened to the highest in nearly 15 years on Thursday, while global equity market