Stocks Climb Higher As Oil Prices Fall NEW YORK - Stocks regained some momentum Thursday as oil prices declined in spite of Hurricane Ivan's damper on production in the Gulf of Mexico, and fresh economic data suggested inflation remains well under control.    Analysts are closely watching stocks for signs that the market will stabilize in the second half of the year, but volatile moves on news have made it difficult to build confidence among investors, particular given recent fluctuations in oil prices...