title: How to find the element's x center coordinates and related window offset
body: <p>i would like to retrieve the element offset starting from his own x center coordinates.</p>
  
  <p>how can i do it?</p>
  
  <p>Actually i can find the window offset of an element but it retrieves the coordinates from the border of the element like this:</p>
  
  <pre><code>var _position = $(this).offset();
  </code></pre>