Cannot remove <li> bullets when using jCarousel

Hi all,

I'm trying to use jCarousel with Drupal 6.3. I've been able to produce a working carousel but I cannot prevent the list items from displaying a bullet (just the same as in the navigation menu). When I look at my page using Firefox's DOM inspector, it tells me that UL and LI elements are configured with "list-style-type=none" and "list-style-image=none". But I do see the bullets! :-(

Does anyone has some hint about this problem?

Many thanks in advance.
Franck

Just in case it can help: I've installed the module nodeCarousel in order to have the PHP function jcarousel_add, then I've create a PHP node with the following content (don't joke at me, this is really my first use of PHP and JavaScript, advices are welcome):

<?php jcarousel_add(); ?>

<ul id="mycarousel" class="jcarousel-skin-tango">
<?php
$img = array("http://static.flickr.com/66/199481236_dc98b5abb3",
	     "http://static.flickr.com/75/199481072_b4a0d09597",
	     "http://static.flickr.com/57/199481087_33ae73a8de",
	     "http://static.flickr.com/77/199481108_4359e6b971",
	     "http://static.flickr.com/58/199481143_3c148d9dd3",
	     "http://static.flickr.com/72/199481203_ad4cdcf109",
	     "http://static.flickr.com/58/199481218_264ce20da0",
	     "http://static.flickr.com/69/199481255_fdfe885f87",
	     "http://static.flickr.com/60/199480111_87d4cb3e38",
	     "http://static.flickr.com/70/229228324_08223b70fa");

for ($i=0; $i<count($img); $i++) {
    echo "<li><img src='$img[$i]_s.jpg' id='thumb$i' width='75' height='75' alt=''/></li>";
}
echo '</ul>';
echo "<p><img src='$img[0]_m.jpg' id='mypict'>";
?>
<script type="text/javascript">
jQuery(document).ready(function(){jQuery("#mycarousel").jcarousel({initCallback: function(){jQuery("#mycarousel").css("list-style-type", "none"); jQuery("#mycarousel").find("li").css("list-style", "none none inside");}});});
function update_mypict(image, target) {
    jQuery(image).click(function(){jQuery('#mypict').attr('src', target);});
}
<?php
for ($i=0; $i<count($img); $i++) {
    echo "jQuery(document).ready(function(){update_mypict('#thumb$i','$img[$i]_m.jpg');});";
}
?></script>