does anyone know how..?

Who knows how the following slider-function is made? I am talking about the big slider, with the smaller bar of thumbs on the homepage of this site.

If I understand it correctly, the smaller bar of thumbs is used to navigate through the big slider faster. But how?

I know there are plugins that make the topslider, and ones that make the bar of smaller thumbs underneath. But how do you make one where you got the small thumbs to navigate through the large slider? And then put your posts ofcourse in the large slider?

I am an amateur, so if anyone knows this, or knows where to get something similar, please explain it almost in a childlike manner ??

My thanks is great!