Need page navigation added to micro/mini thumbnail page in Xtreme theme

I am using the X-Treme theme by Pedro Gilberto. What I want to do is add a navigation to the mini thumbs page. Here is a link to the page in question. http://daredeviltattoo.com/gallery2/main.php?g2_itemId=1044
As you can see, It looks like there are just 20 thumbnails here. But really there are about 70 i think. Just below the thumbnails in the bottom right corner, you can see double arrows, they show that there are more thumbnails to go to. But the arrows dont do anything. I would like it if there are more thumbnails on the page than can be displayed, that a page navigation shows up that says "Page 1, 2, 3, 4, .." that would let you know what page you are on and would allow you to click to the next page. Is this possible? Is it already built in?