Understanding the scope of variable and function, class in programming clearly is key to appreciating how your variables interact with the rest of your source code. In many languages, this can be quite straightforward, but JavaScript’s anonymous functions and event handling features, along with a little of quirks, mean that handling scope in your JavaScript applications can become frustrating.

This article discusses how JavaScript handles scope and how various JavaScript libraries provide methods for dealing with it and how they smooth out a few bumps. We’ll also look at how you can get back to basics and do some interesting scope wrangling without a library, a useful approach if you’re writing code that needs to stand alone.

Navigation menu - a feature that can not be missed on the website, beside it helps your users navigate and access necessary content on the whole website easily, it also helps you save space on website by displaying content on dynamic tabs. This article presented to summarize the free navigation menu codes with jQuery, by criterias: nice look, cool animation and eye-catching.

With the huge amount of information nowaday, with the tons of content you want to display; maybe the scrolling features are the best choices. In this JavaScript article, author came up with 13 cool and elegant JavaScript scroller, if you are a web-designer and web developer it is easy to understand.

This JavaScript code is for dragging and dropping content cells of table. Table can contain colspan and rowspan cells. Large tables will be autoscrolled if dragged object come close to the page border. Dropping to some table cells can be forbidden with setting className="forbid".

Drop Down Navigation Panel helps you save the web space by creating a nice pull down panel on the top of your page that contains external content fetched via AJAX. Your visitors click on the protruding button to drop the panel down and reveal its content. Closing it by clicking anywhere on the panel again. You can easily customize the height of the Panel, button label and the speed of drop down in milliseconds. A very cool plug and play AJAX drop down panel!

Your website have a sound/music system? Are you looking for a cool music player? And you are fan of Apple/iPod? If your answer is 'Yes', let embed this mp3 player script into your web page then let the music play. This package includes seven styles for your choice, beside it also have the ACP version if you are using vBulletin board.

PolyTooltip - a very easy way to make HTML tooltips on your web page. This Prototype tooltip script generates tooltips by small information boxes for many type of objects on your website such as link tooltip, form tooltip, div tooltip... It is good looking and very simple to use. PolyTooltip uses the Prototype Framework and Scriptaculous Effects Library. And there are four styles availble.

This JavaScript code - date picker helps you choose a time through a popup window. Perhaps this feature is not new on JavascriptBank.com, but you can customize this calendar control code to create new effects that require the controls through another window page.

Note: please enable popup (and ActiveX if you use Internet Explorer) to run this calendar script properly.

This JavaScript code do not use MARQUEE tag but features & actions are similar to this tag, meaning you can make some page content that continuously move by the four directions, stop moving on mouseover,... With this code, almost you only use JavaScript to install a "MARQUEE" for dynamic content. The web contents are simply defined as normal HTML, contained in a DIV element with a unique ID attribute.

A JavaScript code to build the multi level menu on your web pages, each item has a icon for itself; this script works on all poppular browsers, but more beautiful in Internet Explorer because it uses filters in engine of this browser for performing fade effects.