var sDIV_CONTINENTE_ID='continente_id';
var sDIV_NAZIONE_ID='nazione_id';
var sDIV_CITTA_ID='citta_id';
var sDIV_CATEGORIA_ID='listaCategorie';
var sACTION_GET_NATIONS='fileadmin/ajax/nazione.php';
var sACTION_GET_CITIES='fileadmin/ajax/citta.php';
var sACTION_GET_CATEGORIES='fileadmin/ajax/categoria.php';
//var sRESET_STRING_NAZIONI='Scegli la nazione';
var sRESET_STRING_CITTA='<option class="firstOption" value="">Scegli la citta\'</option>';
var sMETHOD='post';

function getNations()
{

    var sMethod=sMETHOD;
                      
	var pElementContinente  = getElement_ById('select_'+sDIV_CONTINENTE_ID);

	var sNumberContinente = pElementContinente.value;

	var sAction=sACTION_GET_NATIONS;
	var sQueryString='&continente='+sNumberContinente; 
	var sIdElementToFill=sDIV_NAZIONE_ID;                     

	callAction(sAction, sQueryString, sMethod, sIdElementToFill);                       

	var pElementCitta = getElement_ById('select_'+sDIV_CITTA_ID);
	// var pElementCategorie = getElement_ById('select_'+sDIV_CATEGORIA_ID);
                        
	//pElementCitta.innerHTML =sRESET_STRING_CITTA;
	var pElementNazione  = getElement_ById('select_'+sDIV_NAZIONE_ID);
	pElementNazione.value='';
	getCities();


}


function getCities()
{

    var sMethod=sMETHOD;
                      
	var pElementNazione  = getElement_ById('select_'+sDIV_NAZIONE_ID);

	var sNumberNazione = pElementNazione.value;

	var sAction=sACTION_GET_CITIES;
	var sQueryString='&nazione='+sNumberNazione; 
	var sIdElementToFill=sDIV_CITTA_ID;                     

	callAction(sAction, sQueryString, sMethod, sIdElementToFill);                       

	var pElementCategorie = getElement_ById(sDIV_CATEGORIA_ID);
	
	var pElementCitta  = getElement_ById('select_'+sDIV_CITTA_ID);
	pElementCitta.value='';
	getCategories();
                        

}


function getCategories()
{

    var sMethod=sMETHOD;
                      
	var pElementCitta  = getElement_ById('select_'+sDIV_CITTA_ID);

	var sNumberCitta = pElementCitta.value;

	var sAction=sACTION_GET_CATEGORIES;
	var sQueryString='&citta='+sNumberCitta; 
	var sIdElementToFill=sDIV_CATEGORIA_ID;                     

	callAction(sAction, sQueryString, sMethod, sIdElementToFill);                       

}