function AJAXInteraction(url, callback)
{
    var req = init();
    req.onreadystatechange = processRequest;

    function init()
    {
        if (window.XMLHttpRequest)
        {
            return new XMLHttpRequest();
        }
        else if (window.ActiveXObject)
        {
            return new ActiveXObject("Microsoft.XMLHTTP");
        }
    }

    function processRequest()
    {
        // readyState of 4 signifies request is complete
        if (req.readyState == 4)
        {
            // status of 200 signifies sucessful HTTP call
            if (req.status == 200)
            {
                if (callback) callback(req.responseText);
            }
        }
    }

    this.doGet = function()
    {
        req.open("GET", url, true);
        req.send(null);
    }
}