valor = Math.round(Math.random() * 5);
if ((valor == 0)){
	document.write('<style>#jogo{background-image: url(img/topo_jogo.jpg);}#desc{background-image: url(img/topo_desc.jpg);</style>');
}
else
if ((valor == 1)){
	document.write('<style>#jogo{background-image: url(img/topo02_jogo.jpg);}#desc{background-image: url(img/topo02_desc.jpg);</style>');
}
else
if ((valor == 2)){
	document.write('<style>#jogo{background-image: url(img/topo03_jogo.jpg);}#desc{background-image: url(img/topo03_desc.jpg);</style>');
}
else
if ((valor == 3)){
	document.write('<style>#jogo{background-image: url(img/topo04_jogo.jpg);}#desc{background-image: url(img/topo04_desc.jpg);</style>');
}
else
if ((valor == 4)){
	document.write('<style>#jogo{background-image: url(img/topo05_jogo.jpg);}#desc{background-image: url(img/topo05_desc.jpg);</style>');
}
else
if ((valor == 5)){
	document.write('<style>#jogo{background-image: url(img/topo06_jogo.jpg);}#desc{background-image: url(img/topo06_desc.jpg);</style>');
}