function showDescricao(obj) {
    document.getElementById("boxBarbara").style.display = "none";
    document.getElementById("aBarbara").className = "m1";
    document.getElementById("boxLuni").style.display = "none";
    document.getElementById("aLuni").className = "m2";
    document.getElementById("boxRofer").style.display = "none";
    document.getElementById("aRofer").className = "m3";
    document.getElementById("boxCasa").style.display = "none";
    document.getElementById("aCasa").className = "m4";
    
    document.getElementById("box" + obj).style.display = "block";
    document.getElementById("a"+obj).className = "a" + obj;
}