connect(kcolorbutton, SIGNAL(clicked()), this, SLOT(slotChangeBackground())) ;
connect(horizontalSlider, SIGNAL(valueChanged(int)), this, SLOT(slotChangeBackground())) ;
connect(kcolorbutton, SIGNAL(clicked()), this, SLOT(slotChangeBackground())) ;
connect(horizontalSlider, SIGNAL(valueChanged(int)), this, SLOT(slotChangeBackground())) ;