how to reshape pushbutton??

[anupamgee]

thnx for reply..
i tried setmask(),but still after using this,i got a black boundary of pushbutton ,when i pressed the qpushbutton....
i write the following code:

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
    QPushButton *button_close=new QPushButton(this);
    QPixmap image(":/images/but_00.png");
    button_close->setGeometry(100,100,image.width(),image.height());
    button_close->setFlat(1);
    QSize size(image.width(),image.height());
    button_close->setIconSize ( size );
    button_close->setIcon(image);
    button_close->setMask(image.mask());
}

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
    QPushButton *button_close=new QPushButton(this);
    QPixmap image(":/images/but_00.png");
    button_close->setGeometry(100,100,image.width(),image.height());
    button_close->setFlat(1);
    QSize size(image.width(),image.height());
    button_close->setIconSize ( size );
    button_close->setIcon(image);
    button_close->setMask(image.mask());
}

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Is something wrong in code??
or Is there any other way to do this??
plzz specify..