function handleOnMakeChange(dd1)
{
  var idx = dd1.selectedIndex;
  var val = dd1[idx].text;
  var par = document.forms["frmSelect"];
  var parelmts = par.elements;
  var modelsel = parelmts["Regiao"];
  var city = val;
  if (city != "Select city")
  {
 	Http.get({
		url: "./addons/ajax2combo/data/" +  city + ".txt",
		callback: fillModel,
		cache: Http.Cache.Get
	}, [modelsel]);
  }
}

function fillModel(xmlreply, modelelmt)
{
  if (xmlreply.status == Http.Status.OK)
  {
    var modelresponse = xmlreply.responseText;
    var modelar = modelresponse.split("|");
    modelelmt.length = 1;
    modelelmt.length = modelar.length;
    for (o=1; o < modelar.length; o++)
    {
      modelelmt[o].text = modelar[o];
    }
  }
  else
  {
    alert("Cannot handle the AJAX call.");
  }
}