var http_request = false;

function makeRequest(url, func, post, parameters) {
	http_request = false;
	if (window.XMLHttpRequest) {
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/xml');
		}
	} 
	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 = func;
	if (post) {
		http_request.open('POST', url, true);
		http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		http_request.setRequestHeader("Content-length", parameters.length);
		http_request.setRequestHeader("Connection", "close");
		http_request.send(parameters);
	} 
	else {
		http_request.open('GET', url, true);
		http_request.send(null);	
	}
}
function referFriend(){
	if(
		noEmpty('refer_friend_email') &&
		noEmpty('refer_friend_name')
	){
		var args = "refer_friend_email=" + getValue('refer_friend_email') + 
		"&refer_friend_name="+getValue('refer_friend_name');
		makeRequest("refer_a_friend.php?"+args, processreferAFriend, false, '')
	}
}

function processreferAFriend(){
	if (http_request.readyState == 4) {
		if (http_request.status == 200) {
			var the_response = http_request.responseText;
			hideDiv('refer_a_friend_id');
			showDiv('refer_a_friend_id_done');
		} 
		else {
			alert('There was a problem with the request.');
        }
    }
}