var category = '';

function GetXmlHttpObject() {
	var xmlHttp=null;

	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}

	catch (e) {
		// Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
	
		catch (e) {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}

function category_stateChanged() {
	if(xmlHttp.readyState==4) {
		document.getElementById('man').innerHTML = xmlHttp.responseText;
	}
}

function form_stateChanged() {
	if(xmlHttp.readyState==4) {
		document.getElementById('ff').innerHTML = xmlHttp.responseText;
	}
}

function model_stateChanged() {
	if(xmlHttp.readyState==4) {
		document.getElementById('mod').innerHTML = xmlHttp.responseText;
	}
}

function set_category(cat) {
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null) {
		alert ("Your browser does not support AJAX!");
		return;
	}
	
	category = cat;
	
	var url="../data/main_search.php";
	url=url+"?type=manuf"
	url=url+"&cat="+cat;
	xmlHttp.onreadystatechange=category_stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function set_form(cat, manuf) {
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null) {
		alert ("Your browser does not support AJAX!");
		return;
	}
	
	var url="../data/main_search.php";
	url=url+"?type=form"
	url=url+"&cat="+cat;
	url=url+"&manuf="+manuf;
	xmlHttp.onreadystatechange=form_stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function set_model(manuf) {
//function set_model(cat) {
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null) {
		alert ("Your browser does not support AJAX!");
		return;
	}
	
	var url="../data/main_search.php";
	url=url+"?type=model"
	url=url+"&cat="+category;
	url=url+"&manuf="+manuf;
	//url=url+"&form="+ff;
	xmlHttp.onreadystatechange=model_stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}