>>Check whether this is what you need:
>>

>>document.getElementById('MyTable').style.display='none';
>>document.getElementById('MyTable').style.backgroundColor='#CCCCCC';
>>document.getElementById('MyTable').style.display='block';
>>

>
>I tried:
>
>

>document.getElementById('MyTable').style.display='none';
>document.getElementById('MyTable').style.backgroundColor='FFFFFF';
>document.getElementById('MyTable').style.display='';
>

>
>but, that is still the same. It works on the first try. Then, on another other try to go with another color, it is locked.

What version of NS have you tested?
It works on:

Netscape 6.2.2
Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.4.1) Gecko/20020314 Netscape6/6.2.2

btw. the second command is

document.getElementById('MyTable').style.display='block';