Timer delay

[bmn]

I am trying to implement a GUI having some push buttons & a window to display image.
There are two buttons Start & Stop
When the start button is pushed, a sequence of images stored in an array of QString has to be displayed.
When Start button is pushed, new_dialog() Slot is called.
The code for new_dialog() is as follows:

void Custom_window::new_dialog()
{
    list[0] = "/home/suresh/Desktop/Test/gui_client/newflower.png";
    list[1] = "/home/suresh/Desktop/Test/gui_client/mod_xfce-in-the-moon.png";
    list[2] = "/home/suresh/Examples/logo-Kubuntu.png";
    list[3] = "/usr/share/xfce4/backdrops/xfce-smoke.png";
    list[4] = "/usr/share/xfce4/backdrops/xubuntu-steel.png";
 
    for(int i=0;i<5;++i)
    {
        QTimer *timer = new QTimer;
        QPixmap p(list[i]);
        p= p.scaled( old_window->width(), old_window->height(), Qt::IgnoreAspectRatio,         Qt::SmoothTransformation);
        old_window->resize(500,480);
        old_window->setPixmap(p);
        timer->start(5000);
        connect(timer, SIGNAL(timeout()),old_window , SLOT(setPixmap(p)));
     }
 
}

void Custom_window::new_dialog()
{
    list[0] = "/home/suresh/Desktop/Test/gui_client/newflower.png";
    list[1] = "/home/suresh/Desktop/Test/gui_client/mod_xfce-in-the-moon.png";
    list[2] = "/home/suresh/Examples/logo-Kubuntu.png";
    list[3] = "/usr/share/xfce4/backdrops/xfce-smoke.png";
    list[4] = "/usr/share/xfce4/backdrops/xubuntu-steel.png";

    for(int i=0;i<5;++i)
    {
        QTimer *timer = new QTimer;
        QPixmap p(list[i]);
        p= p.scaled( old_window->width(), old_window->height(), Qt::IgnoreAspectRatio,         Qt::SmoothTransformation);
        old_window->resize(500,480);
        old_window->setPixmap(p);
        timer->start(5000);
        connect(timer, SIGNAL(timeout()),old_window , SLOT(setPixmap(p)));
     }

}

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The problem I was facing is that I was able to display only the last frame.
And the error I am facing is
Object::connect: No such slot QLabel::setPixmap(p)
But I was able to see the last image.