Stocks finished the week with modest gains, with trading volume light ahead of the long holiday weekend.  The Dow closed up .31 percent on light volume to end the week at 12,441.58, while housing stocks closed mixed.  MSCI gained .52 percent, Sun communities was up .44 percent, and ELS posted a .26 percent gain.  Cavco dropped .68 percent.  Skyline Corporation, Nobility Homes, Deer Valley, and Palm Harbor Homes all closed flat.  The Manufactured Housing Composite fell .37 percent to end the week at 1106.50.  U.S. markets were closed yesterday, May 30, in honor of Memorial Day.