function comprobar(){
    var error; error =""; 
    //alert(formu.EMAIL.value);
    if (!verifyEmail(formu.EMAIL.value)){
        error += "Introduzca su email correctamente\n\r";
    }

   

    if (error != ""){
        alert(error);
        return false;
    }else{
        document.formu.submit();
        return true;
    }
}