To make the Xxx category hidden you have to do it in the header.php file which is in your skin folder, and also leftside.php. There is some PHP code which loops through the available categories and displays links to each one. You can do this:

Find :

PHP Code: 
        if($categories[$i] == 'Xxx')
        {
?>
            <img src="<?php echo $site_url?>/skins/<?php echo $skin?>/arrow.gif" height="8" width="4" alt="<?php echo $keywords?>" /> <a target="_self" href="<?php echo $site_url?>/porno-<?php echo $categories[$i]; ?>.htm" title="<?php echo $categories[$i]; ?> Downloads"><?php echo $categories[$i]; ?></a> (<?php echo $categoryCountArray['theCount']; ?>)<br />
<?php
        
}
        else
        {
?>
            <img src="<?php echo $site_url?>/skins/<?php echo $skin?>/arrow.gif" height="8" width="4" alt="<?php echo $keywords?>" /> <a target="_self" href="<?php echo $site_url?>/type-<?php echo $categories[$i]; ?>.htm" title="<?php echo $categories[$i]; ?> Downloads"><?php echo $categories[$i]; ?></a> (<?php echo $categoryCountArray['theCount']; ?>)<br />
<?php
        
}
Replace that with

PHP Code: 

?>
            <img src="<?php echo $site_url?>/skins/<?php echo $skin?>/arrow.gif" height="8" width="4" alt="<?php echo $keywords?>" /> <a target="_self" href="<?php echo $site_url?>/type-<?php echo $categories[$i]; ?>.htm" title="<?php echo $categories[$i]; ?> Downloads"><?php echo $categories[$i]; ?></a> (<?php echo $categoryCountArray['theCount']; ?>)<br />
<?php
PM me and I'll follow up on the pop up thingy you need!