function $get(id){
    return document.getElementById(id)
}

function aparesol(numero) {
    var1 = "sol_1_" + numero;
    var2 = "sol_2_" + numero;
    var3 = "lsol_" + numero;
    var4 = "lsol_" + numero + "_1";
    var5 = "solu_" + numero;
    if($get("lsol_1")) $get("lsol_1").className = "lsol_1_2";
    if($get("lsol_2")) $get("lsol_2").className = "lsol_2_2";
    if($get("lsol_3")) $get("lsol_3").className = "lsol_3_2";
    if($get("lsol_4")) $get("lsol_4").className = "lsol_4_2";
    if($get("solu_1")) $get("solu_1").style.display = "none";
    if($get("solu_2")) $get("solu_2").style.display = "none";
    if($get("solu_3")) $get("solu_3").style.display = "none";
    if($get("solu_4")) $get("solu_4").style.display = "none";
    if($get("sol_1")) $get("sol_1").className = var1;
    if($get("sol_2")) $get("sol_2").className = var2;
    if($get(var5)) $get(var5).style.display = "block";
    if($get(var3)) $get(var3).className = "lsol_1_1";
}