statusbarpanel#msnpreview-status {
    list-style-image: url("chrome://msnpreview/content/msnon.png");
}

statusbarpanel#msnpreview-status[status="1"] {
    list-style-image: url("chrome://msnpreview/content/msnon.png");
}

statusbarpanel#msnpreview-status[status="0"] {
    list-style-image: url("chrome://msnpreview/content/msnoff.png");
}