#exchWebService-add-attachment-button {
    -moz-image-region: rect(0px 96px 24px 72px);
}
#exchWebService-add-attachment-button[disabled="true"],
#exchWebService-add-attachment-button[disabled="true"]:hover {
    -moz-image-region: rect(48px 96px 72px 72px);
}
#exchWebService-add-attachment-button:hover {
    -moz-image-region: rect(24px 96px 48px 72px);
}

toolbar[iconsize="small"] #exchWebService-add-attachment-button {
    -moz-image-region: rect(0px 64px 16px 48px);
}
toolbar[iconsize="small"] #exchWebService-add-attachment-button[disabled="true"],
toolbar[iconsize="small"] #exchWebService-add-attachment-button[disabled="true"]:hover {
    -moz-image-region: rect(32px 64px 48px 48px);
}
toolbar[iconsize="small"] #exchWebService-add-attachment-button:hover {
    -moz-image-region: rect(16px 64px 32px 48px);
}

