Qt3 : How to set the background??

[Kunkka]

there are much fewer functions be used to set background than qt4 .

playWidget->setPaletteBackgroundPixmap(QPixmap(":/images/background.png"));
    playWidget->show();

playWidget->setPaletteBackgroundPixmap(QPixmap(":/images/background.png"));
    playWidget->show();

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these codes were lost on the widget!

nobody? i just want to paint a picture on a widget named by playWidget under the environment of qt3!