Accordion-Menu Icons Not Displaying

i’m trying to get the accordion menu extension up and running and for some reason the icons aren’t showing up. there aren’t any icons included in the download or on the github page nor does the css file contain any definitions for the icons. so where is it supposed to be accessing them from? has anyone gotten this extension working with the current version of yii or know any more about the extension? thanks for any help or direction you can offer.