reduce space-size of buttons

[clepto]

Hello,

look at the pictures here:
http://ubuntuone.com/6rpPTkQeIauvyZQhMoUh0p
http://ubuntuone.com/47k64UGZRjpzVL0aEkADay

as you can see i have some buttons and i want to reduce the space between them, in the second picture you can see that the button get the most space...
i have created the button with this code (example for play button) :

mplay_pauseButton.setIcon(mplayIcon);
mplay_pauseButton.setIconSize(mplayPixmap.rect().size());
mplay_pauseButton.setFlat(true);

mplay_pauseButton.setIcon(mplayIcon);
mplay_pauseButton.setIconSize(mplayPixmap.rect().size());
mplay_pauseButton.setFlat(true);

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were mplayPixmap is the pixmap with the icon

any idea how to reduce the space?