function(e){e.something...} who is e?
<p>just now i ask a question, and it creates a new question.</p>

<p>for example, when i wrote</p>

<pre><code>$("#new_lang").click(function(e) 
{
  alert("something");
  e.stopPropagation();
});
</code></pre>

<p>who is <strong>e</strong> here, and why it doesn't work without it?
why can i write anything instead of e?</p>

<p>Thansk</p>
