Forms question regarding Alerts

I have an alert that pops up asking the user for input. The buttons available are "Yes" and "No" but I can't figure out how to test for the answer. Actually...it's the syntax that I don't know about. I'm sure it's as easy as:



But the problem is I know that will not work and I need to get the proper syntax. Any help is greatly appreciated.

To display the alert, issue the SHOW_ALERT built-in. SHOW_ALERT is a function that returns a numeric constant that corresponds to the button that the operator selected from the alert. If the operator selects...
Oracle Forms returns -
Button 1 = ALERT_BUTTON1
Button 2 = ALERT_BUTTON2
Button 3 = ALERT_BUTTON3

Example -------
DECLARE alert_button NUMBER;
BEGIN alert_button := SHOW_ALERT('the name of your alert');
IF alert_button = ALERT_BUTTON1 THEN
-- Insert code associated with button 1.
ELSIF alert_button = ALERT_BUTTON2 THEN
-- Insert code associated with button 2.
END IF;
-- No code executes if operator selects button 3, the Cancel button.
END;