check if your browser/javascript supports Ajax.
For this we can use prototype's getTransport method.

A small example demonstrating inheritance in Javascript, complete with calling base class constructors and methods. For the more detailed description, visit http://www.adampresley.com.

A simple AJAX class. The code for the class is provided as well as example HTML and PHP code for usage.

Given a PHP array (even a deep nested array), returns a string representation of that array as JavaScript array. Useful when using PHP to output JavaScript.

Format fractional digits in a numbe

To debug javascript code we use alert() whereever needed and it irritates you while alerts values inside a loop and other places where more alerts are being shown and you have to press the ok button to pass / proceed on.
here is a simple way to get rid of the alerts dialogs and get the values outputed into another debug window.

Trim , Left trim (ltrim) and Right Trim (rtrim) in javascript

Gives you control to perform actions when the control key and the mouse button is clicked in the same time. Something similar to selecting elements in Windows with ctrl+click.

Just change the event.ctrlKey to event.shiftKey to make it shift+click. If you don't get it don't worry the snippet contains the demo for shift+click too.

You may need to change the event.which though 1 = left click, 2 = middle click, 3 = right click(at least in firefox 1.5.0.5)

Strips all tags from any string.

Similar to Perl's CGI::escapeHTML(), though (because we can!) this adds it as a method to all String objects.