var aTowns;
var aDetails;
function setTows(cId)
{
	var oTown = document.getElementById('town_id');
	var oTownOptions = oTown.options;
	var i = 1;
	for(var townId in aTowns[cId])
	{
		var value = townId;
		var label = aTowns[cId][townId];
		var opt = new Option(label, value);
		if(oTownOptions[i]) oTownOptions[i] = null;
		oTownOptions[i] = opt;
		i++;
	}
}
function setAreasDetails(cId)
{
	var oDetails = document.getElementById('details_id');
	var oDetailsOptions = oDetails.options;
	var i = 1;
	for(var detailId in aDetails[cId])
	{
		var value = detailId;
		var label = aDetails[cId][detailId];
		var opt = new Option(label, value);
		if(oDetailsOptions[i]) oDetailsOptions[i] = null;
		oDetailsOptions[i] = opt;
		i++;
	}
}