Thanks to Glynn Clements and Giacomo Boffi.
Yes, what I need is 
xrdb -merge ~/.Xdefaults
Another problem is why I need to apply "xrdb ..." every time when I
restart the Linux system? Do I miss something?
Thanks,
Zhu Wang
SMU
On Wed, 2003-05-28 at 17:40, Glynn Clements wrote:
 zhu wang wrote:
 
 > I have a .Xdefauts to change Xemacs color as following:
 > 
 > Emacs.default.attributeBackground:  White
 > 
 > But after I apply xrdb -load ~/.Xdefaults,
 > 
 > The Mozilla menu bar font is changed to a small size. I am wondering how 
 > to keep me Xemacs color and not change Mozzilla menu bar font.
 
 Before you run "xrdb -load ...", try running "xrdb -query". If it
 produces any output, then don't use "xrdb -load ..." , but use
 "xrdb -merge ..." instead. 
-- 
zhu wang <zhuw(a)mail.smu.edu>