Padding and Margin issue in ie 6

I was getting an error of double padding in ie6. As I have put padding in parent container. In ie6 it is taking padding of double pixels. For that I got some CSS hacks:
For Internet Explorer 6:
padding:2px;
_padding:0px;
But by using hacks html page doesn’t remain compatible with W3C standards.
The solution for that is using separate CSS [...]