title: Howto trigger jQuery event after scrolling to certain object on page (not "if scrollTop" solution)
body: <p>I want to float a layer as soon as I am scrolling to a certain point on a page. But my page is not static in height, but (very) dynamic. So this known solution will not work for me:</p>
  
  <pre><code>if($(window).scrollTop() &gt; 1000) { 
     // do this
  }
  </code></pre>
  
  <p>That's the reason I am wondering if there is a posibility to fire an event at the very moment a certain object (e.g. a div) has appeared on my screen?</p>
  
  <p>Other solutions are also welcome of course.</p>