Changing Environment

I am trying to change the text color of the command line according to which user is logged in. I have placed the following in both '/etc/profile' and '/etc/bashrc' , but it doesn't work.

if [ $USER = 'root' ] ; then
        COLOUR=41  #red
        COLOUR=44  #blue

I am using RH6, what I am missing to make this work?
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(I wasnt aware that you could change the colour but anyway ...)
try changing the if statement to use the enviroment variable $LOGNAME instead of USER.
if [ $LOGNAME = 'root' ]; then

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