Calling a javascript function at the end of button click code behind

How do you call a javascript function at the end of button click code behind?

From stackoverflow

• You probably want the onmouseup event:

  <button onmouseup="alert('You release the mouse button!')">Click me</button>
  

• If you're working in .NET you could try

  ScriptManager.RegisterClientScriptBlock(myButton, this.GetType(), "BlockName", "alert('hello world');", true);
  

  Chetan : this really worked... thanks :)