Simple z-index problem

[harjanto]

this is an example dom tree:

document.body
_____parentNode1
_____parentNode2
__________childNode1

Can childNode1 ever appear above parentNode1? I've tried giving childNode1 a higher z-index but for some reason it still appears below parentNode1

What am I doing wrongly?

Thanks for the help

[_Aerospace_Eng_]

Umm yeah that example was useless. We need to see your html and CSS.