is this for jailbroken 1.1.3?http://www.all-Apple.com/2007/11/26/summerboard-download.html
Here is where I downloaded my summerboard from.
SSHed following files in the following directory
SummerBoard.framework -> /Library/Frameworks/SummerBoard.framework
SMBPrefs.app -> /Applications/SMBPrefs.app
Themes -> /var/root/Library/SummerBoard/Themes
com.apple.SpringBoard.plist -> /System/Library/LaunchDaemons/
Hope this works!
Get the dock to work by replacing the following files with dock images of your choice.
Than your dock should work too!
P.S - Back up all files, if you ever want to revert to the original.