function ajaxModelo(url)
{
req = null;
// Procura por um objeto nativo (Mozilla/Safari)


if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
		req.onreadystatechange = AtualizaModelo;
		req.open("GET",url,true);
		limpaSel();
		req.send('');
		

// Procura por uma versão ActiveX (IE)
} else if (window.ActiveXObject) {
	req = new ActiveXObject("Microsoft.XMLHTTP");
	if (req) {
	req.onreadystatechange = AtualizaModelo;
	req.open("GET",url,true);
	limpaSel();
	req.send('');
	

	}
	 else {
		alert("Seu Browser(Mozila, Internet Explorer, Safari)?");
	}
  }
}

function limpaSel(){
	var x=document.getElementById("modelo");
	total = x.length;
	for (i=0;i<=total;i++)
    {
   x.remove(x.options[i]);
    }
	}

function AtualizaModelo()
{
if (req.readyState == 4 || req.readyState == 0) {

if (req.status == 200) {

aux = req.responseText;

erro = "erro";
if(aux == erro){
alert(aux);
}else{
	try{
		var str =aux.split("pulalinha");
		var x=document.getElementById("modelo");

			try{
				var y=document.createElement('option');
	y.text="Modelo";
	y.value="";
	x.add(y,null); 
	var y=document.createElement('option');
	y.text="-------------";
	y.value="0";
	x.add(y,null); 
			}
		catch(e){
				var y=document.createElement('option');
	y.text="Modelo";
	y.value="";
	x.add(y); 
	var y=document.createElement('option');
	y.text="-------------";
	y.value="0";
	x.add(y); 
			}
		for(i=0; i < str.length - 1; i++) {
			var y=document.createElement('option');
			try{
				//firefox
				var y=document.createElement('option');
				y.text=str[i];
				y.value=str[i];
				x.add(y,null);
				}
			catch(Ex){
				var y=document.createElement('option');
				y.text=str[i];
				y.value=str[i];
				x.add(y);	
			}

		}
		
}

catch(Exception){
	document.getElementById("modelo").value = innerHTML = aux;
	}
}
}
else {
alert("Houve um problema, tente novamente:n" + req.statusText);
}
}
}