How to do email vaildation in javascript?

How do you create in javascript to do email vaildation? to check

must contain 1 @
must contain 1 letter before the @
must contain 1 letter after the @
must not contain spaces, slash, colon, comma or semicolon

if the any of the rules are wrong it will alert the user saying "Invalid Email"

 

This article pretty much sums it up i think : http://www.4guysfromrolla.com/webtech/052899-1.shtml

 

you can use some JavaScipts for validating email address from my site:
- Email Validation script
- Email Validation Checker
- and more JavaScripts

Thank