var op_sel = 0;
if (document.images) {

	img_op1_on = new Image();
	img_op1_on.src = "../../imagens/op1_on.gif";

	img_op1_off = new Image();
	img_op1_off.src = "../../imagens/op1_off.gif";

	img_op2_on = new Image();
	img_op2_on.src = "../../imagens/op2_on.gif";

	img_op2_off = new Image();
	img_op2_off.src = "../../imagens/op2_off.gif";

	img_op3_on = new Image();
	img_op3_on.src = "../../imagens/op3_on.gif";

	img_op3_off = new Image();
	img_op3_off.src = "../../imagens/op3_off.gif";

	img_op4_on = new Image();
	img_op4_on.src = "../../imagens/op4_on.gif";

	img_op4_off = new Image();
	img_op4_off.src = "../../imagens/op4_off.gif";

	img_op5_on = new Image();
	img_op5_on.src = "../../imagens/op5_on.gif";

	img_op5_off = new Image();
	img_op5_off.src = "../../imagens/op5_off.gif";

	img_op6_on = new Image();
	img_op6_on.src = "../../imagens/op6_on.gif";

	img_op6_off = new Image();
	img_op6_off.src = "../../imagens/op6_off.gif";
	}

function mudaimagem(imagem,estado) {
	if (document.images)  {
	    document.images[imagem].src = estado.src;
	}
}

function limpa() {
	if (op_sel != 0) {
	    document.getElementById('fop'+op_sel).style.background = "url(../../imagens/img8.gif)";
		document.getElementById('op'+op_sel).style.visibility = "visible";
    }
}

function selecciona2(fundo) {
	if (op_sel != 0) {
	    document.getElementById('fop'+op_sel).style.background = "url(../../imagens/img8.gif)";
		document.getElementById('op'+op_sel).style.visibility = "visible";
    }
    op_sel = fundo;
    document.getElementById('fop'+fundo).style.background = "url(../../imagens/op"+fundo+".gif)";
	document.getElementById('op'+fundo).style.visibility = "hidden";
}