function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}

var http = createRequestObject();

function sndReq(manufacturer) {
	loadingDisplay();
    http.open('get', '/js/get-used-models.php?manufacturer='+manufacturer);
    http.onreadystatechange = handleResponse;
    http.send(null);
}

function handleResponse() {
    if(http.readyState == 4){
        var response = http.responseText;
        var data = JSON.parse(response);
        //alert(data.length);
        var obj = document.getElementById('model');
        obj.options.length=1;
        for(i=0;i<data.length;i++)
        {
            obj.options[i+1]=new Option(data[i].model,data[i].model); 
        }
		setTimeout(loadingHide, 1000);
    }
}

function loadingDisplay() {
	var label = document.getElementById('model-label');	
	label.className = 'loading';
	}

function loadingHide() {
	var label = document.getElementById('model-label');	
	label.className = '';	
	}