http://www.bitsum.com/firmware_mod_kit.htm
"Firmware Modification Kit
Giving YOU the power to customize your firmware
documentation version 0.60 beta
all scripts, untrx, wrt_vx_imgtool, and docs (c) 2008 Jeremy Collake <jeremy.collake@gmail.com>
http://www.bitsum.com
other portions (c) their respective holders"