[Mediawiki-l] Copy the MonoBook Skin

Is it possible to make a copy of the MonoBook skin, and then rename it to something else? I want to copy the MonoBook skin, and then start modifying it from there. So far, I know that you have to copy the MonoBook folder and rename it to the skin name. You then have to copy Monobook.php and rename it to the skin name. You then have to change the lines - class SkinChristmas extends SkinTemplate { /** Using monobook. */ function initPage( &$out ) { SkinTemplate::initPage( $out ); $this->skinname = 'Christmas'; $this->stylename = 'Christmas'; $this->template = 'ChristmasTemplate'; } } In this example, it would make a skin called Christmas. Where do you go from here? What has to be modified in SkinTemplate.php and SkinPHPTal.php?