title: Javascript: having a scrollable fixed position element
body: <p>I'm trying to achieve the following:<br>
  I have a pop-in menu docked to the left side of the screen.<br>
  The menu has only a small tab visible. Upon hover - it pops to accommodate its content.<br>
  The problem is, my pages are sometimes a few screens in height.
  And sometime, so is my menu.<br>
  I wish to be able to dock my menu to a fixed position (so the tab is always visible), and have the menu scrollable, without the ugly scrollbars.</p>
  
  <p>How could this be achieved?</p>