swfdisplayitem->skewx() adds ddegrees to current x-skew.
The object may be a swfshape(), a swfbutton(), a swftext() or a swfsprite() object. It must have been added using the swfmovie->add().
See also swfdisplayitem->skewx(), swfdisplayitem->skewy() and swfdisplayitem->skewyto().