function Comprobar() {
  if ((formSuscripcion.nombre.value=="")||(formSuscripcion.email.value=="")||(formSuscripcion.clave.value=="")||(formSuscripcion.telefono.value=="")||(formSuscripcion.direccion.value=="")||(formSuscripcion.codigo_postal.value=="")||(formSuscripcion.poblacion.value=="")||(formSuscripcion.organizacion.value=="")||(formSuscripcion.profesion.value=="")) {alert("All fields should be filled in, except for mobile phone, country, fax and areas of interest, which are optional.");return false}
  if ((formSuscripcion.email.value.indexOf ('@',0)==-1)||(formSuscripcion.email.value.length<8)) {alert("Please make sure you have introduced a valid email");return false}
  if (!formSuscripcion.acepto.checked) {alert("Please confirm your acceptance of our data protection policy.");return false}
  else document.formSuscripcion.submit()}

 function LP_data(num,mas){ 
  var key=window.event.keyCode;
 if (key<43||key>57){window.event.keyCode=0;}
 if(key==44 ||key==45 ||key==46 ||key==47){window.event.keyCode=0;}
 if(key==43 && mas){window.event.keyCode=0;}
}