public String getColumnName(int col) {
		String s = "";
		switch (col) {
			case 0 : s="De";
			break;
			case 1 : s="Para";
			break;
			case 2 : s="DataIni";
			break;
			case 3 : s="DataFim";
			break;
			case 4 : s="Historico";
			break;
			case 5 : s="Valor";
			break;
		}
		return s;
	}