if (document.images) {

		Empresa = new Image();
		Empresa_down = new Image();
		Servicos = new Image();
		Servicos_down = new Image();
		Atuacao = new Image();
		Atuacao_down = new Image();
		Clientes = new Image();
		Clientes_down = new Image();
		Filiais = new Image();
		Filiais_down = new Image();
		Boleto = new Image();
		Boleto_down = new Image();

		Empresa.src = "imagens/btn-home-Empresa-0.gif";
		Empresa_down.src = "imagens/btn-home-Empresa-1.gif";
		Servicos.src = "imagens/btn-home-Servicos-0.gif";
		Servicos_down.src = "imagens/btn-home-Servicos-1.gif";
		Atuacao.src = "imagens/btn-home-Atuacao-0.gif";
		Atuacao_down.src = "imagens/btn-home-Atuacao-1.gif";
		Clientes.src = "imagens/btn-home-Clientes-0.gif";
		Clientes_down.src = "imagens/btn-home-Clientes-1.gif";
		Filiais.src = "imagens/btn-home-Filiais-0.gif";
		Filiais_down.src = "imagens/btn-home-Filiais-1.gif";
		Boleto.src = "imagens/btn-home-Boleto-0.gif";
		Boleto_down.src = "imagens/btn-home-Boleto-1.gif";

}

function buttonOn(imageName) {
	if (document.images) {
		document[imageName].src = eval(imageName+"_down.src")
		}
	}

function buttonOff(imageName) {
	if (document.images) {
		document[imageName].src = eval(imageName+".src")
		}
	}