.bt_home {display: block;background-color: transparent;background-image: url(../images/bt_home.png);background-repeat: no-repeat;background-position: -50px 0px;float:left;width: 50px;height: 21px;margin:0px 10px 0px 0px;}
.bt_historia {display: block;background-color: transparent;background-image: url(../images/bt_historia.png);background-repeat: no-repeat;background-position: -70px 0px;float:left;width: 71px;height: 21px;margin:0px 8px 0px 0px;}
.bt_pedepes {display: block;background-color: transparent;background-image: url(../images/bt_pedepes.png);background-repeat: no-repeat;background-position: -80px 0px;float:left;width: 74px;height: 21px;margin:0px 13px 0px 0px;}
.bt_orgaos {display: block;background-color: transparent;background-image: url(../images/bt_orgaos.png);background-repeat: no-repeat;background-position: -70px 0px;float:left;width: 70px;height: 21px;margin:0px 8px 0px 0px;}
.bt_arquivo {display: block;background-color: transparent;background-image: url(../images/bt_arquivo.png);background-repeat: no-repeat;background-position: -80px 0px;float:left;width: 70px;height: 21px;margin:2px 8px 0px 0px;}
.bt_sugestoes {display: block;background-color: transparent;background-image: url(../images/bt_sugestoes.png);background-repeat: no-repeat;background-position: -100px 0px;float:left;width: 100px;height: 21px;margin:0px 0px 0px 324px;}
.bt_contactos {display: block;background-color: transparent;background-image: url(../images/bt_contactos.png);background-repeat: no-repeat;background-position: -100px 0px;float:left;width: 95px;height: 21px;margin:0px 0px 0px 10px;}

.bt_home:hover, .bt_historia:hover, .bt_pedepes:hover, .bt_orgaos:hover, .bt_arquivo:hover, .bt_sugestoes:hover, .bt_contactos:hover  { background-position: 0px 0px;cursor: pointer;}
.bt_home span, .bt_historia span, .bt_pedepes span, .bt_orgaos span, .bt_arquivo span, .bt_sugestoes span, .bt_contactos span  { position:absolute;left:-900px;}

.bt_home_off{display: block;background-color: transparent;background-image: url(../images/bt_home.png);background-repeat: no-repeat;background-position: 0px 0px;float:left;width: 50px;height: 21px;margin:0px 10px 0px 0px;}
.bt_historia_off {display: block;background-color: transparent;background-image: url(../images/bt_historia.png);background-repeat: no-repeat;background-position: 0px 0px;float:left;width: 71px;height: 21px;margin:0px 8px 0px 0px;}
.bt_pedepes_off {display: block;background-color: transparent;background-image: url(../images/bt_pedepes.png);background-repeat: no-repeat;background-position: 0px 0px;float:left;width: 74px;height: 21px;margin:0px 13px 0px 0px;}
.bt_orgaos_off {display: block;background-color: transparent;background-image: url(../images/bt_orgaos.png);background-repeat: no-repeat;background-position: 0px 0px;float:left;width: 70px;height: 21px;margin:0px 8px 0px 0px;}
.bt_arquivo_off {display: block;background-color: transparent;background-image: url(../images/bt_arquivo.png);background-repeat: no-repeat;background-position: 0px 0px;float:left;width: 70px;height: 21px;margin:2px 8px 0px 0px;}
.bt_sugestoes_off {display: block;background-color: transparent;background-image: url(../images/bt_sugestoes.png);background-repeat: no-repeat;background-position: 0px 0px;float:left;width: 100px;height: 21px;margin:0px 0px 0px 324px;}
.bt_contactos_off {display: block;background-color: transparent;background-image: url(../images/bt_contactos.png);background-repeat: no-repeat;background-position: 0px 0px;float:left;width: 95px;height: 21px;margin:0px 0px 0px 10px;}
.bt_home_off span, .bt_historia_off span, .bt_pedepes_off span, .bt_orgaos_off span, .bt_arquivo_off span, .bt_sugestoes_off span, .bt_contactos_off span  { position:absolute;left:-900px;}

.bt_eixos {
display: inline;
float:left;
width: 40px;
padding:0px 5px;
}
.bt_programas {
display: inline;
float:left;
width: 80px;
padding:0px 8px;
}
.bt_medidas {
display: inline;
float:left;
width: 80px;
padding:0px 5px;
}

.bt_eixos span, .bt_programas span, .bt_medidas span {display:inline}
.bt_eixos span.show, .bt_programas span.show, .bt_medidas span.show {display:none}
.bt_eixos:hover span, .bt_programas:hover span, .bt_medidas:hover span {display:none}
.bt_eixos:hover span.show, .bt_programas:hover span.show, .bt_medidas:hover span.show {display:inline;font-weight: bold}

.bt_eixos_off {
font-weight: bold;
display: inline;
float:left;
width: 40px;
padding:0px 5px;
}
.bt_programas_off {
font-weight: bold;
display: inline;
float:left;
width: 80px;
padding:0px 8px;
}
.bt_medidas_off {
font-weight: bold;
display: inline;
float:left;
width: 80px;
padding:0px 5px;
}