x-menu-bg.png - not used ?
x-menu-bg-ie6.gif - x-menu.css
x-menu-bg-v.png - not used ?
x-menu-bg-v-ie6.gif - x-menu.css
x-menu-grad.gif - x-menu.css
x-menu-ico-sub-item.gif - x-menu.css
x-menu-ico-sub-item-hover.gif - x-menu.css
x-menu-item-border.gif - x-menu.css
x-menu-item-hover-bg.gif - x-menu.css
x-menu-item-ico.gif - not used ?
x-menu-item-pointer.gif - not used ?
x-menu-item-pointer2.gif - not used ?