Change thumbnail color without select attribute number

Hi, my name is Emerson and I have a online shop. One thing I’d to know is, there’s some way to the thumbnail change without select the attribute number bellow?

Example: Shoes black and red. When I clic on the color black, the thumbnail’s black will show without firt I select the number.
Today the thumbail change just if you select the attribute number…

The page I need help with: [log in to see the link]