mes/WebContent/resource2/resources/ext/ux/css/TabScrollerMenu.css

.x-tab-tabmenu-right {
    background: transparent url('images/tab-scroller-menu.gif') no-repeat 0 0;
    width:18px;
    height: 20px;
    cursor:pointer;
    zoom: 1;
    z-index: 6;
    float: right;
}
.x-tab-tabmenu-over {
    background-position: -18px 0;
}
.x-tab-tabmenu-disabled {
    background-position: 0 0;
    opacity:.5;
    -moz-opacity:.5;
    filter:alpha(opacity=50);
    cursor:default;
}