The dollar's index, having eased 0.3% so far this week, stood at 93.602 =USD, near its lowest level since late September. By Hideyuki Sano TOKYO, Oct 21 (Reuters) - Commodity currencies stood near multi-month highs on Thursday on strong raw material prices while the improved risk mood saw the U.S. dollar losing earlier momentum built from expectations the Federal Reserve would tighten monetary policy. Sterling was also riding high on firming perceptions the Bank of England (BoE) will raise interest rates as soon as next month to curb inflation, despite softer-than-expected UK price data on Wednesday.