Turn off right and left columns front page only

[Goldenis]

Have inserted the index statement several different places in the style sheet with no result. Last location shown below. Does it matter where it is inserted? Classic 1.3.9h Thank You!

#navColumnOne, #navColumnTwo {
background-color: transparent;
}

#indexHomeBody #navColumnOne, #indexHomeBody #navColumnTwo {display: none;}