Updating individual cells with AJAX

[lindenmj]

I was wondering if there was a method to update a cell in a table that had a unique id? Something with <td id="xxxxx"></td> or in a <div> tag. The table will have hundreds of cells.

Here is my quick and dirty code (stolen from here ):

function getXmlHttpRequestObject() {
	if (window.XMLHttpRequest) {
		return new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		return new ActiveXObject("Microsoft.XMLHTTP");
	} else {
		alert("Your browser doesn't support the XmlHttpRequest object.  Better upgrade to Firefox.");
	}
}

var receiveReq = getXmlHttpRequestObject();

function sayHello() {
	if (receiveReq.readyState == 4 || receiveReq.readyState == 0) {
		receiveReq.open("GET", 'SayHello.html', true);
		receiveReq.onreadystatechange = handleSayHello; 
		receiveReq.send(null);
	}			
}

function handleSayHello() {
	if (receiveReq.readyState == 4) {
		document.getElementById('span_result').innerHTML = receiveReq.responseText;
	}
}

The way I'm trying to do it is pass a variable into the "handleSayHello" function so it would change the element ID that matches the variable (or "the individual cell"). When I try that nothing happens. Thanks.