function mostrarMapa(iddiv1,iddiv2,iddiv3) {
 if (document.getElementById(iddiv1).style["display"] == "none") {
 document.getElementById(iddiv1).style["display"] = "block";
 document.getElementById(iddiv2).style["display"] = "none";
 document.getElementById(iddiv3).style["display"] = "none";
 }
}