A while ago I put up a Password Strength Checker using JavaScript and Regular Expressions. On that same note, you can also check the structure of an email address utilizing the same methodology: If your form element has the id=emailaddress and you add a form onSubmit=”return checkEmail();”, this is a Javascript function that you can utilize to return an alert if the email address has a valid structure or not: <script language="javascript"> function checkEmail() { var email = document.getElementById(‘emailaddress’); var … Continue reading →