Clicking on either of the buttons should move the "hasimage" class from one outer div to the other, thereby activating the following rule, for the element which has the "hasimage" class:

        .hasimage .inner {
            background-image:url(http://yui.yahooapis.com/2.6.0/build/assets/skins/sam/sprite.png);
        }
    

Instead, the background-image stays 'stuck' on the first div to which it is applied.

Apply Image to One Apply Image to Two