U.S. stock indexes score modest gains Thursday, after Fed expands rescue funding up to $2.3 trillion -Dow settles 1.2% higher at 23,719.37 -SandP 500 index ends up 1.5% at 2,789.82 -Nasdaq closes 0.8% higher at 8,153.58  #DOW #US30 #SPX500 #NASDAQ #MarketWatch