var XmlHttpObj;

// create an instance of XMLHTTPRequest Object, varies with browser type, try for IE first then Mozilla
function CreateXmlHttpObj() {
	
	// try creating for IE (note: we don't know the user's browser type here, just attempting IE first.)
	try {
		XmlHttpObj = new ActiveXObject("Msxml2.XMLHTTP");
	} catch(e) {
		try {
			XmlHttpObj = new ActiveXObject("Microsoft.XMLHTTP");
		} catch(oc) {
			XmlHttpObj = null;
		}
	}
	
	// if unable to create using IE specific code then try creating for Mozilla (FireFox) 
	if(!XmlHttpObj && typeof XMLHttpRequest != "undefined") {
		XmlHttpObj = new XMLHttpRequest();
	}
}

function registerEmailAddress(form) {	
    var registerEmail = document.getElementById("registerEmail").value;
    
    // url of page that will send xml data back to client browser
	
	var requestUrl = "/registerEmail.php?registerEmail=" + encodeURIComponent(registerEmail);
	
	CreateXmlHttpObj();
	
	// verify XmlHttpObj variable was successfully initialized
	if(XmlHttpObj) {
        // assign the StateChangeHandler function ( defined below in this file)
        // to be called when the state of the XmlHttpObj changes
        // receiving data back from the server is one such change
		XmlHttpObj.onreadystatechange = StateChangeHandler;
		
		// define the iteraction with the server -- true for as asynchronous.
		XmlHttpObj.open("GET", requestUrl,  true);
		$("#sendRegistration").html('<img src="http://images.citibox.es/registerWaiting.gif" width="66" height="10" style="margin-top:17px;" alt="Registering your Email Address... Please Wait" title="Registering your Email Address... Please Wait" border="0" />');
		// send request to server, null arg  when using "GET"
		XmlHttpObj.send(null);
	}
}

function StateChangeHandler() {
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4) {
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200) {
			showQuoteResponse(XmlHttpObj.responseXML.documentElement);
		} else {
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}
function showQuoteResponse(xmlResponse) {
	$("#quoteWaiting").fadeOut('slow');
	if (xmlResponse.getElementsByTagName("success")[0].childNodes[0].nodeValue == 'FAIL') {
		$("#sendRegistration").html('Registrate');
		var registrationResponse = xmlResponse.getElementsByTagName("errorMessage")[0].childNodes[0].nodeValue;
		$("#registerResponse").html(registrationResponse);
		$("#registerResponse").delay(600).slideDown('slow');
		
	} else {
		$("#registerEmail").fadeOut('slow');
		$("#registerName").fadeOut('slow');
		$("#sendRegistration").fadeOut('slow');
		var registrationResponse = xmlResponse.getElementsByTagName("pageText")[0].childNodes[0].nodeValue;
		$("#registerResponse").html(registrationResponse);
		$("#registerResponse").delay(600).slideDown('slow');
	}
}