How is it possible.. a good question!
I will not do it for you, but here is how I would work it out on a test site.
open the colorlabs arthemia premium demo (link above)
check the source code of this site for javascript he is loading:
jquery.js?ver=1.4.2
jquery.jcarousel.pack.js?ver=3.0.4
you could link them from google like:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
additionally there is this script loaded in header.php before the /head tag:
<script type="text/javascript">
function mycarousel_initCallback(carousel)
{
// Disable autoscrolling if the user clicks the prev or next button.
carousel.buttonNext.bind('click', function() {
carousel.startAuto(0);
});
carousel.buttonPrev.bind('click', function() {
carousel.startAuto(0);
});
// Pause autoscrolling if the user moves with the cursor over the clip.
carousel.clip.hover(function() {
carousel.stopAuto();
}, function() {
carousel.startAuto();
});
};
jQuery(document).ready(function() {
jQuery('#mycarousel').jcarousel({
auto: 2,
scroll: 1,
wrap: 'last',
vertical: true,
initCallback: mycarousel_initCallback
});
});
</script>
having these two scipts loaded you need the css styles they use, find them in source code of the site here:
demo.colorlabsproject.com/arthemia/wp-content/themes/arthemia-premium/css/jquery.jcarousel.css
just use in your style.css or load in an extra file
Having these (three) scripts and the styles in your test site you can try to set in your index.php this line
<?php query_posts("showposts=4&category_name=Featured"); $i = 1; ?>
to show 6 or 8 items:
<?php query_posts("showposts=8&category_name=Featured"); $i = 1; ?>
If you are lucky your featured starts scrolling, the arrows below you can think about yourself if you need.
It's work, sorry, at the end there might be just a div to add or to change, compare source code of your site and the demo site.