function Ajax (url, parms, method, callback) {
    this.url = url;
    this.parms = parms;
    this.method = method;
    this.callback = callback;
    this.async = true;
    this.create ();
    this.req.onreadystatechange = this.dispatch (this);
}

Ajax.prototype.dispatch = function (ajax) {
    function funcRef()
    {
        if (ajax.req.readyState == 4) {
            if (ajax.callback) {
                ajax.callback (ajax.req);
            }
        }
    }
    return funcRef;
}
Ajax.prototype.request = function () {
    if (this.method == "POST") {
        this.req.open("POST", this.url, this.async);
        this.req.send (this.parms);
    }
    else if (this.method == "GET") {
        this.req.open("GET", this.url + this.parms, this.async);
        this.req.send (null);
    }
}
Ajax.prototype.setAsync = function (async) {
    this.async = async;
}
Ajax.prototype.create = function () {
    var xmlhttp;
    if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
        try {
            xmlhttp = new XMLHttpRequest();
        } 
		catch (e) {
            xmlhttp = false;
        }
    }
	if (!xmlhttp)
	{
        try {
            xmlhttp = new ActiveXObject('Msxml2.XMLHTTP');
        } 
		catch (e) {
            xmlhttp = false;
        }
	}
	if (!xmlhttp)
	{
        try {
            xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
        } 
		catch (e) {
            xmlhttp = false;
        }
	}
	if (!xmlhttp)
	{
        try {
            xmlhttp = new IFrameRequest();
        } 
		catch (e) {
            xmlhttp = false;
        }
	}
    this.req = xmlhttp;
    
}