function ahah(url, canvasId) {
	var req;
	var objCanvas = document.getElementById(canvasId);
	objCanvas.innerHTML = "Loading...";
	if(window.XMLHttpRequest) {
		req = new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		req = new ActiveXObject("MSXML2.XMLHTTP");
	}
	if(req != undefined) {
		req.onreadystatechange = function() {ahahDone(req, canvasId);};
		req.open("GET", url, true);
		req.send("");
	}
}

function ahahDone(req, canvasId) {
	var objCanvas = document.getElementById(canvasId);
	if(req.readyState == 4) { // only if req is "loaded"
		if(req.status == 200) { // only if "OK"
			objCanvas.innerHTML = req.responseText;
		} else {
			objCanvas.innerHTML = "ahah Error: " + req.statusText;
		}
	}
}