function valEmail(valor){
    re=/^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3})$/
    if(!re.exec(valor))    {
        return false;
    }else{
        return true;
    }
}

//Validacion de formularios
//Mary
function valida(valor, tipo) {
  switch(tipo) {
    case 'telephone' : reg = /^[0-9\-\.\(\)\ ]+$/; break;
    case 'email'     : reg = /^[a-zA-Z0-9_\.\-]+\@([a-zA-Z0-9\-]+\.)+[a-zA-Z0-9]{2,4}$/; break;
    case 'date'      : reg = /^[0-9]{4}\-\[0-9]{1,2}\-\[0-9]{1,2}$/; break; //format YYYY-mm-dd
    case 'number'    : reg = /^[0-9\ ]+$/; break;     //Only Numbers
    case 'noSpecial' : reg = /^[0-9a-zA-Z]+$/; break; //No special caracteres
    case 'string'    : reg = /^[a-zA-Z\ \']+$/; break; //Only string
  }

  //Validation
  if(!reg.exec(valor)) {
    return false;
  }else{
    return true;
  }
}