public boolean action(Event e, Object arg) {
        
		Object target = e.target;
         
        	if (target == button1) { 
            		button2.disable();
            		button1.disable();
            		button3.enable();
            		return true;
        	}
        	if (target == button3) { 
            		button2.enable();
            		button1.enable();
            		button3.disable();
            		return true;
        	}
        	return false;
    	}