It should be like this:
<img src="http://www.slapadrone.com/images/bmclose3.gif" id="img">
You will then want to keep the line
this.css("display", "block"); in the
The reason why you're experiencing a jump on the page load is that you have included some third-party widgets (Twiiter and FB).
The chances are that these are holding everything else up.
This should be a last resort though.