Modify Style2.css (Change sprite_general.gif reference from "absolute" to "relative")

In style2.css -

change:

#navigation-inner .selected span.collapsed {
background-image: url(http://next.dev.curriki.org/xwiki/skins/curriki8/images/sprite_general.gif);
background-repeat: no-repeat;
}

to:

#navigation-inner .selected span.collapsed {
background-image: url(images/sprite_general.gif);
background-repeat: no-repeat;
}