Code in widget causes theme to break

I’ve added some code to a text widget, and it does work (giving a media player for my online radio station), but it breaks the theme and causes the footer to rise up.

It is probably easier to see this to know what I mean:

https://www.farehamradio.com

Is there something I can do to stop this happening?

This is the code used:

<div id="player"><a href="https://www.macromedia.com/go/getflashplayer">Stream</a>
<script type="text/javascript" src="/player/swfobject.js"></script>
<script type="text/javascript">
var s1 = new SWFObject("/player/player.swf","ply","350","35","9","#FFFFFF");
s1.addParam("allowfullscreen","false");
s1.addParam("allowscriptaccess","always");
s1.addParam("flashvars","file=https://orange.citrus3.com:8022/;stream.nsv&type=sound&volume=35&duration=-999999999999&autostart=true");
s1.write("player");</script>

Thanks.