Donna, isn't this accomplished already on the normal category pages?
To work with categories you are probably going to want to include /include/func/func.category.php
Its been a while since I needed to do something like this, but if I remember correctly the function you want to use is func_get_category_data()
Read through that file and see if the function you need is in there.
BTW, I see from your signature you are running 4.6.6, now we can be sure that you are from the future. j/k
