Evaluate Your JavaScript

Usually people have hard time in evaluating their JavaScript code, I found a interesting tool which helps to evaluate the Javascript JSLint - The JavaScript Code Quality Tool. Its quiet easy to use; navigate to
http://www.jslint.com/
Example: This will help ensure our code is compatible with IE 6 and IE 7.

Strict white space

Assume a browser

Disallow undefined variables

Disallow == and !=

Alternatively, you can add this line to your javascript. This will ensure these values are "checked".