Add an autoslidex

Hello to everybody,
I am new with Modx and I would like to install the following extras:
http://modxcms.com/extras/package/36

I tried to follow the instructions, but without success.
Is there any of you so kind to help me step by step? Or can you suggest an esiest photogallery to install?

Thanks in advance.
Regards
John

Hello,
I made some progress; now I can see the player but not the images.
All the files, swf player, js and images are in the following folder: /assets/images/slideshow/madrid.xml
I create a new page and paste this code:

<div id="container"><a href="http://www.macromedia.com/go/getflashplayer">Get the Flash Player</a> to see this rotator.</div>
<script src="assets/images/slideshow/swfobject.js" type="text/javascript"></script>
<script type="text/javascript">// <![CDATA[
var s1 = new SWFObject("/assets/images/slideshow/imagerotator.swf","rotator","400","200","7");
s1.addParam("allowfullscreen","true");
s1.addVariable("file","/assets/images/slideshow/madrid.xml");
s1.addVariable("width","400");
s1.addVariable("height","200");
s1.write("container");
// ]]></script>

Any help is really appreciate.
Thanks and Regards
John

Have you tried the full path to the xml file?
Flash can be picky with relative paths