[TYPO3-english] Customize content types

[Enrique Moreno Tent]

Hey guys. I've created some content-element types with this code:

TCEFORM.tt_content.header_layout{
    altLabels {
      2 = white Box
      1 = green Box
      0 = Normal
    }
}

And now I would like to wrap some <div class="white-box"> and so around
them, depending on their type. How can i do this?