The Dow dropped 117.53 points on report of pending job cuts at Cisco and renewed fears of nuclear leaks at Japanese nuclear plant to close at 12,263.58.  Deer Valley lost 29.27 percent, Skyline Corp. fell 6.91 percent, Cavco lost 2.03 percent and Nobility Homes fell .56 percent.  The Manufactured Housing Composite lost 4.41 percent to close at 1134.90.