Email-Verifier

Validates email addresses by checking for formatting errors and cross-checking the TLD with ICANN

To use, simply add this in your header:

<script src="emailverifier.js"></script>

To validate an email using JavaScript, use:

if (validateEmail(yourtextbox.value)) //Valid Email

A simple demo that alerts the user whether the email is Valid or Invalid:

alert(validateEmail(yourtextbox.value)?"Valid":"Invalid");

Some example valid email addresses:
foo.bar@gmail.com	Standard email
booo000oood@yahoo.jp	Japan TLD
boss@nick.digital	DIGITAL TLD
w@yxz.us	US TLD

Some example invalid email addresses:
extra-dot@typo..com	Touching ..
wrong@tld.yippy	Invalid TLD
starwars-at-at@@rocks.co	Touching @@
fail.@fail.fail	Touching .@