http://rtfm.modx.com/extras/revo/gallery/gallery.gallery
itemCls The CSS class to use for each item. gal-item activeCls The CSS class to add if the item is the "active" item. gal-item-active
itemCls The CSS class to use for each item. gal-item activeCls The CSS class to add if the item is the "active" item. gal-item-active