[Lynne]

Except if you look at the function, or the page source itself:

<a href="group.php?do=grouplist&amp;cat=1" class="sg_catcloudlink sg_catlevel1">Uncategorized</a>

you'll see that these are the classes that affect the size of the tags:

a.sg_catlevel1 {
    font-size: xx-small;
}
a.sg_catlevel2 {
    font-size: small;
}
a.sg_catlevel3 {
    font-size: medium;
}
a.sg_catlevel4 {
    font-size: large;
}
a.sg_catlevel5 {
    font-size: large;
    font-weight: bold;
}