Thanks very much. I will work on it.
After installing, you will have the advanced form validations at the top of the behaviors menu. Select the second text field and go to Behaviors --> Advanced Form Validations --> Life Entry Validation and make sure the even it onBlur, or select the form and do the same but put it onSubmit.
Best of all, it's a free extension.
Thank you Robert. I have installed the plug-in and will test it out as soon as I figure out how to configure the Submit button.