var request = getHTTPObject();
if(request){
	request.onreadystatechange = doSomething;
	request.open("POST", "file.ext", true);
	request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	request.send("name=whatever+goes+here&message=hello+world");
}

Simple Ajax POST request using the getHTTPObject function.

Ajax Post Request

ajax, post

JavaScript