.icon-extra {background-image: url(/sprites/icons_extra.png)}

.icon-extra.icon-photo-zoom {background-position: 0 0; width: 33px; height: 26px}
.icon-extra.icon-warning {background-position: -35px 0; width: 18px; height: 18px}
.icon-extra.icon-question {background-position: -35px -22px; width: 18px; height: 18px}