title: How to get the caller event and dom element id
body: <pre><code>&lt;script&gt;
  function Hello(){
      var caller =  arguments.callee.caller;
      alert( caller );
  }
  &lt;/script&gt;
  
  &lt;input type="button" id="btnHello" value="Hello" onclick="Hello()" /&gt;
  </code></pre>
  
  <p>How to get the button id from the the Hello function above with out passing the any argument in the Hello function</p>