I use jQuery on our sites. You need to include <script> references in the main Masterpage. In the xml.config file you need to output your featured products into some unordered lists in a div, say, called 'slider'.
Code:
<div id="slider">
<ul>
<li>one </li>
<li> two</li>
...
</ul>
</slider>
Then do something like this to call it:
Code:
$(function() {
$('#slider').easySlider({
auto: true,
speed: 900,
pause: 12000,
continuous: true,
numeric: true
});
});
We can't teach you XSLT or jQuery on a forum, but this is everything you need to get it done. In general, when dealing with jQuery, it's often easier than you think. The key is understanding selectors. If you know CSS, you can select any elements and do stuff to it.
Hope this helps!