wp featured content slider nav question

I am trying to modify this slider script. You can see it here: http://aissolutions.ca/clients/enerquality/ It is working good. The only thing I want to change is instead of having the prev / next button arrows below the text to change the slider, I want to have a “circle” navigation, like it is on this site: http://www.builtgreencanada.ca/ Does anyone know how this can be done?
Thanks.