#xpclButtonAdd {
  list-style-image: url("chrome://xpclucene/skin/plus.png");
  -moz-image-region: rect(0px, 16px, 16px, 0px);
  -moz-appearance: toolbarbutton;
}

#xpclButtonAdd:hover:active {
  -moz-image-region: rect(0px, 32px, 16px, 16px);
}

#xpclButtonAdd[disabled="true"] {
  -moz-image-region: rect(0px, 48px, 16px, 32px);
}

#xpclButtonDelete {
  list-style-image: url("chrome://xpclucene/skin/minus.png");
  -moz-image-region: rect(0px, 16px, 16px, 0px);
  -moz-appearance: toolbarbutton;
}

#xpclButtonDelete:hover:active {
  -moz-image-region: rect(0px, 32px, 16px, 16px);
}

#xpclButtonDelete[disabled="true"] {
  -moz-image-region: rect(0px, 48px, 16px, 32px);
}