title: Use SetIcon in leaflet tochange the Icon
body: <p>I try to use the mouseover Event to Change the Icon to another. SetIcon will make a New. But my mouseout Event is lost after the SetIcon. Then I am Not able to restore the old Icon. Any Idea? A good Plugin?</p>
  <p>Also i try to Change the Position of the Pop-up. I disabled the paning. And now the Pop-up is opened relative to the Icon in Hidden when the Icon ist near the top Border.</p>
  <p>Regards
  Chris</p>