I am trying to make a child widget a semi-transparent, so that an image set for the parent widget,can be shine through. I mean the parent's image should be dull in the area,where a child occupied.

I have tried using the setStylesheet("background:transparent"); which makes a widget complete transparent. how do i make a child semi transparent on parent widget. Provide me some refrence if possible.

I have gone thorough this http://doc.trolltech.com/qq/qq16-background.html link, but i dont get what to use and which will be the easy way? i am using Qt-4.6.2.