function validar(b_frm) {
if (frm.city.options[frm.city.selectedIndex].value == "seleccione"){
alert("Por favor, selecciona un destino");
frm.city.focus();
return (false);
}
if (b_frm.city.value == "El Tarter") {
b_frm.ss.value = "El Tarter";
b_frm.city.value = "El Tarter";
}
else if (b_frm.city.value == "Escaldes Engordany") {
b_frm.ss.value = "Escaldes Engordany";
b_frm.city.value = "Escaldes Engordany";
}
else if (b_frm.city.value == "Llorts") {
b_frm.ss.value = "Llorts";
b_frm.city.value = "Llorts";
}
else if (b_frm.city.value == "Pas de la casa") {
b_frm.ss.value = "Pas de la casa";
b_frm.city.value = "Pas de la casa";
}
else if (b_frm.city.value == "-1394439" || b_frm.city.value == "-1394484" || b_frm.city.value == "-1395326" || b_frm.city.value == "-1395403" || b_frm.city.value == "900039622" || b_frm.city.value == "-1395882" || b_frm.city.value == "-1396343" || b_frm.city.value == "-1397029" || b_frm.city.value == "-1396864" || b_frm.city.value == "-1394803" || b_frm.city.value == "-1395275") {
b_frm.ss.value = "";
return (true);

}
}