function mudaFundo(fundo){
		if (fundo==1){
			window.document.getElementById("01").style.display = "none";
			window.document.getElementById("02").style.display = "block";
		} else if (fundo==2){
			window.document.getElementById("01").style.display = "block";
			window.document.getElementById("02").style.display = "none";
		} else if (fundo==3){
			window.document.getElementById("03").style.display = "none";
			window.document.getElementById("04").style.display = "block";
		} else if (fundo==4){
			window.document.getElementById("03").style.display = "block";
			window.document.getElementById("04").style.display = "none";
		} else if (fundo==5){
			window.document.getElementById("05").style.display = "none";
			window.document.getElementById("06").style.display = "block";
		} else if (fundo==6){
			window.document.getElementById("05").style.display = "block";
			window.document.getElementById("06").style.display = "none";
		} else if (fundo==7){
			window.document.getElementById("07").style.display = "none";
			window.document.getElementById("08").style.display = "block";
		} else if (fundo==8){
			window.document.getElementById("07").style.display = "block";
			window.document.getElementById("08").style.display = "none";
		} else if (fundo==9){
			window.document.getElementById("09").style.display = "none";
			window.document.getElementById("10").style.display = "block";
		} else if (fundo==10){
			window.document.getElementById("09").style.display = "block";
			window.document.getElementById("10").style.display = "none";
		} else if (fundo==11){
			window.document.getElementById("11").style.display = "none";
			window.document.getElementById("12").style.display = "block";
		} else if (fundo==12){
			window.document.getElementById("11").style.display = "block";
			window.document.getElementById("12").style.display = "none";
		}
	}