Displaying errors in ASP page?

Hello

On an email Web form when an error message is made visible to the user - for example 'you haven't typed anything in the email field' the form disappears from view and the error messages are the only thing on screen and looks like a redirect yet it's the same test_page.asp page.

How would I prevent that to ensure that the error messages appeared above each form field, so that if a user does not type anything in the name field, the error message appears about that field; if the user does not type anything in the email field, the error message appears above that field/

Thanks!

Steve