.x-toolbar .gx-map-measurelength,
.x-toolbar .gx-map-measurearea {
    background-image: url(../images/measure.png);
}
.x-toolbar .gx-map-measurelength {
    background-position: 0 0;
}
.x-toolbar .gx-map-measurearea {
    background-position: -16px 0;
}