function carregaPagina(pagina){
    document.forms['formvar'].diahojem.value = '';
    document.forms['formvar'].diahojeh.value = '';
    document.forms['formvar'].id_obra.value = '';
    document.forms['formvar'].id_album.value = '';
    
    document.forms['formvar'].pagina.value = pagina;
    document.forms['formvar'].submit();
}