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Use onclientclick event, For sample code check:<br />
<a href="http://stackoverflow.com/questions/7684551/pass-parameter-to-js-function-of-tabcontainer-onclientclick" rel="ugc">http://stackoverflow.com/questions/7684551/pass-parameter-to-js-function-of-tabcontainer-onclientclick</a><br />
Note: If this event return false then only javascript event executes, but if it returns true btoh javascript event and .NET server click event execute.
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Use onclientclick event, For sample code check:
http://stackoverflow.com/questions/7684551/pass-parameter-to-js-function-of-tabcontainer-onclientclick [http://stackoverflow.com/questions/7684551/pass-parameter-to-js-function-of-tabcontainer-onclientclick]
Note: If this event return false then only javascript event executes, but if it returns true btoh javascript event and .NET server click event execute.

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In Javascript, how do I handle/hook a click event on a tab? &nbsp;This is ASP.NET TabPanel.
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In Javascript, how do I handle/hook a click event on a tab?  This is ASP.NET TabPanel.

how to handle click of a tab

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications

ASP.NET

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.