function getModel(makeListId)
{
	makeListFormId = makeListId;
	var makeList = document.getElementById(makeListId);
	var selectedMake = makeList.options[makeList.selectedIndex].value;
	var requestUrl;
	requestUrl = "xml_data_provider.php" + "?filter=" + encodeURIComponent(selectedMake);

	CreateXmlHttpObj();
	if(XmlHttpObj) {
        // assign the StateChangeHandler function ( defined below in this file)
        // to be called when the state of the XmlHttpObj changes
        // receiving data back from the server is one such change
		XmlHttpObj.onreadystatechange = StateChangeHandler;

		// define the iteraction with the server -- true for as asynchronous.
		XmlHttpObj.open("GET", requestUrl, true);

		// send request to server, null arg  when using "GET"
		XmlHttpObj.send(null);
	}
}