function ch_menu(id_r, tipo){
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	if(tipo=='reg'){
		var objselect_citta = document.getElementById('select_citta');
		var objselect_province = document.getElementById('sel_provincia');
		for(i=objselect_citta.length;i>0;i--){
			objselect_citta.options[i]=null;
		}
		for(i=objselect_province.length;i>0;i--){
			objselect_province.options[i]=null;
		}
		objselect_citta.options[0] = new Option('TUTTE', '');
		objselect_province.options[0] = new Option('TUTTE', '');
		var ind_select_citta = 1;
		var ind_select_provincia = 1;
		var arr_provincie_ins = new Array();
		var i;
		for(i=0;i<a_p.length;i++){
			if(a_p[i][0]==id_r || id_r==''){
				objselect_province.options[ind_select_provincia] = new Option(a_p[i][1], a_p[i][2]);
				ind_select_provincia++;
			}
		}
		for(i=0;i<a_c.length;i++){
			if(a_c[i][0]==id_r || id_r==''){
				objselect_citta.options[ind_select_citta] = new Option(a_c[i][2], a_c[i][3]);
				ind_select_citta++;
			}
		}
	}else if(tipo=='prov'){
		if(id_r!=''){
			document.getElementById('group_citty').style.display = "block";
		}else if(id_r==''){
			document.getElementById('group_citty').style.display = "none";
		}
		var objselect_citta = document.getElementById('select_citta');
		for(i=objselect_citta.length;i>0;i--){
			objselect_citta.options[i]=null;
		}
		objselect_citta.options[0] = new Option('TUTTE', '');
		var ind_select_citta = 1;
		for(var i=0;i<a_c.length;i++){
			if(a_c[i][1]==id_r || id_r==''){
				objselect_citta.options[ind_select_citta] = new Option(a_c[i][2], a_c[i][3]);
				ind_select_citta++;
			}
		}
	}
}