//----------------------------------------------------
function dni_correcto(dni) {
  // Formato
  var er_dni = /(X|\d{1})\d{7}-\D{1}/;
  if(!er_dni.test(dni)) {
    return false;
  }

  // Letra
  var splitDni = dni.split("-");
  var dni_numero = splitDni[0];
  var dni_letra  = splitDni[1];

  var letras = 'TRWAGMYFPDXBNJZSQVHLCKE';
  var numero = dni_numero%23;
  if(dni_letra != letras.substring(numero, numero+1)) {
    return false;
  }

  return true;
}
//----------------------------------------------------
function isEmail(string) {
  if(string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1) {
   return true;
  } else {
   return false;
  }
}
//----------------------------------------------------
function verImagen(img_popup) {
  var w_popup = open("../popup_image.php?img_popup="+img_popup, "w_popup", "toolbar=0, scrollbars=0, resizable=no");
  w_popup.focus();
}
//----------------------------------------------------