change variant image with hover instead of click
 

I was wondering how/if there was any easy way to make it so when I have options for a product, a customer could "hover" over the option name in the drop down box instead of "click" the name to change the image. It seems like some people cant figure out how to change the image to see what the color of the candle is. Here is a page with an example, click to change image.

http://www.uscandleco.com/candle/10-hour-unscented-votive-candles.html

Thanks.