disable right column only in Category page

[asdfwen]

Hi, I installed Cherry Zen template. I tested to disable the left column below way only in Category page. It works.

#indexBody #navColumnOne {display:none;}
#indexBody .outer {padding-left:20px;}
#indexBody #contentMainWrapperb {background-image:none;}

However, I tried to disable right column below way. It did not work. I want to keep left column and disable right column. Is there anyone who can help me?

#indexBody #navColumnTwo {display:none;}
#indexBody .outer {padding-right:20px;}
#indexBody #contentMainWrapperb {background-image:none;}

[asdfwen]

Hi, I disable the right column below way. It works. No need to answer now. Thanks!
#indexBody #navColumnTwo {display:none;}
#indexBody .outer {padding-right:0;}
#indexBody #contentMainWrapper {background-image:none;}