title: How do I scroll to an element within an overflowed Div?
body: <p>I have 20 list items inside of a div that can only show 5 at a time. What is a good way to scroll to item #10, and then item #20? I know the height of all the items.</p>
  
  <p>The <code>scrollTo</code> plugin does this, but its source is not super easy to understand without really getting into it. <strong>I don't want to use this plugin.</strong></p>
  
  <p>Let's say I have a function that takes 2 elements <code>$parentDiv</code>, <code>$innerListItem</code>, neither <code>$innerListItem.offset().top</code> nor <code>$innerListItem.positon().top</code> gives me the correct scrollTop for $parentDiv.</p>