Now, Javascript - one of my fav Programming language. I would prefer you to learn Javascript after HTML so you can be the Best Web Programmer. I hope you can see a twitter bird flying on your Screen, just look on page - that bird is designed and moving coz, of javascript whatever web animations, widgets advance Web Application is running due to Javascript. Facebook, G-mail, Yahoo every Site uses Javascript to make their webpage more attractive, Understandable and Secure.
