var http_request = false;

function makeGETRequest(url, parameters, afteraction){
	http_request = false;
	if (window.XMLHttpRequest){
		http_request = new XMLHttpRequest();
			if (http_request.overrideMimeType){
				http_request.overrideMimeType('text/html');
			}
	} 
	else if (window.ActiveXObject){
		try{
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} 
        	catch (e){
			try{
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e){}
		}
	}	
	if (!http_request) {
		return false;
	} 
	http_request.onreadystatechange=afteraction 
	http_request.open("GET",url+'?'+parameters,true)	
	http_request.send(null)
}

function model(m){
	var poststr;
	poststr = 'model='+m;
	makeGETRequest('/car-park/set.php', poststr, onchange_model);
}

function onchange_model(){
	if (http_request.readyState == 4){
		if (http_request.status == 200){
			window.location.href='/car-park/';
		} 
	}
}