How to detect page scroll to a certain point in jQuery?
<p>Imagine this is my page:</p>

<pre><code>&lt;p&gt;hello&lt;/p&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;p class="myPara"&gt;My Paragraph&lt;/p&gt;
</code></pre>

<p>How can I alert a message when the user has scrolled down to the paragraph with the class "myPara" and not before then?</p>
