#btn_plugins_events {
    padding-top:30px!important;
    padding-left: 0!important;
    display: block;
    background-position: 50% 5px, 50% 50%!important;
    background-repeat: no-repeat, repeat!important;
}

#btn_plugins_events {
    background-image:url(images/booking_add.png), url("../../../../themes/default/jquery-ui/images/ui-bg_glass_75_e6e6e6_1x400.png");
}
#btn_plugins_events.ui-state-hover {
    background-image: url(images/booking_add.png), url("../../../../themes/default/jquery-ui/images/ui-bg_glass_75_ffb619_1x400.png");
}