button.m

// ugly "stretched" image
	UIImage* image = [UIImage imageNamed:@"btn.png"];
	[_theButton setBackgroundImage:image forState:UIControlStateNormal];

// nice "stretchable" image
	UIImage* image = [UIImage imageNamed:@"btn.png"];
	UIEdgeInsets insets = UIEdgeInsetsMake(8, 8, 8, 8);
	image = [image resizableImageWithCapInsets:insets];
	[_theButton setBackgroundImage:image forState:UIControlStateNormal];