Handling client post back event

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C#

ASP.NET

Javascript

hello!
i have a question i need to handle the click event of some element like a "td" my form get postbacked buy the event i registered for that event on server isnt fired.

i implemented the IPostBackEventHandler interface and implemented the RaisePostBackEvent as blow:

client code :

window.onload = function ()
{
    document.getElementById("TestTd").onclick = function (e)
    {
        __doPostBack("First args", "Second args");
    }
}

and code at server

public void RaisePostBackEvent (string eventArgument)
    {
        this.InfoLabel.Text = "Handled";   
    }

as i said the form getts submitted but RaisePostBack method dosnt get executed.
thanks alot!