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// Default state for button
button2.isSelected = true
button3.isSelected = false

// Button press handler
func changeButtonImage(sender: UIButton) {
        if sender.isSelected == false {
            button2.isSelected = !button2.isSelected
            button3.isSelected = !button3.isSelected
            
            image2.image = button2.isSelected ? UIImage(named: "select") : UIImage(named: "un-select")
            image3.image = button3.isSelected ? UIImage(named: "select") : UIImage(named: "un-select")
        }
}