This Cross-browser JavaScript Tab Bar offers dynamical data loading with AJAX and a rich API. It supports tabs scrolling, customizable layouts, and nested tabs. Users can select from various predefined skins.

One of the defining features of dhtmlxTabbar is that it's highly customizable, which is a great advantage when looking to build a tab bar that reflects your branding and aesthetics. With the ability to configure the tabbar to meet any look and feel requirements, you can easily tailor the design to match your preferences.
When it comes to where tabs can be positioned, the control supports left, right, top, or bottom orientation, depending on your preferred arrangement. You can also take advantage of the variety of content that you can integrate within each tab page, building rich tabbed interfaces.
In addition to the available content integration, dhtmlxTabbar offers other nifty features. For instance, the tab content can either be displayed in IFrames or be dynamically loaded on demand, thanks to AJAX. You can also create multiline, scrollable, or nested tabs, and choose from different predefined styles that are included.
Lastly, it's worth noting that dhtmlxTabbar can be used under either GPL or commercial license (PRO edition). With its abundance of features and configuration possibilities, dhtmlxTabbar is definitely worth considering for developers looking to add a sophisticated tabbar control to their web-based products.
Version 1.2: Custom style for each tab; 'Close tab' button; Auto tab positioning;Auto size of tab; Different loading modes within one tabbar
Version 1.0: N/A