function updateModels(selectedMake,ModelDiv,selectedDealer) {
	var xmlHttpReq = false;
	var self = this;
	var query = 'make='+selectedMake;
	if (selectedDealer) {
		query = query+'&dealer='+selectedDealer;
	}
	if (window.XMLHttpRequest) {
		self.xmlHttpReq = new XMLHttpRequest();
	}
	else if (window.ActiveXObject) {
		self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
	}
	self.xmlHttpReq.open('POST','/cgi-bin/models.cgi', true);
	self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	self.xmlHttpReq.onreadystatechange = function() {
		if (self.xmlHttpReq.readyState == 4) {
			ModelDiv.innerHTML = self.xmlHttpReq.responseText;
		}
	}
	self.xmlHttpReq.send(query);
}