title: How to position a div at the top of another div
body: <p>The first div is the <code>'#icon-selection-menu'</code> bar, it's idle position is <em>absolute</em> with <code>top:0px</code> and <code>left:0px</code>. So it appears at he top left corner inside the content div.</p>
  
  <p>Deep in the content div children I got other divs which are actually kind of '.emoticon-button'. Their position is relative inside their parent. On such button click I'd like to position the first div just above the button, adjusting it's bottom border to the button's top border.</p>
  
  <p>How can I get <em>top</em> and <em>left</em> values to set <code>$('#icon-selection-menu').top</code> and <code>$('#icon-selection-menu').left</code> ?</p>