Question about RXVT

Dear,
I am using RHEL3, I am using QVWM be my default VM, and I use URXVT to my default terminal, but I can't show dircolor on it. using xterm it can show dircolor.
I already set the eval `dircolor -b` in my .bashrc, but it still not show dircolor.
when I login, and type "set", it show COLORS=/etc/DIR_COLORS, and LS_COLORS=. and I try to run "dircolor -b" in terminal, is show

Code:

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LC_COLORS='';
export LS_COLORS

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but when I using PUTTY to login, then it will have color on it. using command 'set', those COLORS and LS_COLORS are have values.
Why?? Why using URXVT login can't show dircolor, and using PUTTY didn't show dircolor.
Thanks.

putty creates a login shell with sources .bash_profile
rxvt may be a mere shell which in that case woudl souce .bashrc
so placing the variables in the appropriate files will help !