function rand(n) {
	return Math.floor((Math.random() * n) + 1);
}
if (document.getElementById("fundo-home")) {
	letra = String.fromCharCode(96 + rand(9));
	document.getElementById("fundo-home").setAttribute("class", "home fundo-" + letra);
	document.getElementById("fundo-home").setAttribute("className", "home fundo-" + letra);
}
else if (document.getElementById("fundo-sid")) {
	letra = String.fromCharCode(96 + rand(9));
	document.getElementById("fundo-sid").setAttribute("class", "total fundosid-" + letra);
	document.getElementById("fundo-sid").setAttribute("className", "total fundosid-" + letra);
}
else if (document.getElementById("fundo-limpo")) {
	letra = String.fromCharCode(96 + rand(9));
	document.getElementById("fundo-limpo").setAttribute("class", "total-2 fundolimpo-" + letra);
	document.getElementById("fundo-limpo").setAttribute("className", "total-2 fundolimpo-" + letra);
}