a .buttonBox{
    background-image:url(../../images/estilos/sea/b.png);
}

a:hover .buttonBox{
    background-image:url(../../images/estilos/sea/bs.png);
}

a .buttonBoxPause{
    background-image:url(../../images/estilos/sea/b.png);
}

a:hover .buttonBoxPause{
    background-image:url(../../images/estilos/sea/bs.png);
}