AJAX

Hi there, first time posting!

I'm using RL-ARM 4.12 release.

I've used to follow the official guide (http://www.keil.com/product/brochures/rl-arm_gs.pdf).

At page 77 you may find an AJAX example.
Here is a snippet from the example where you open the connection with the server

 xmlHttp = GetXmlHttpObject();
 if(xmlHttp == null) {
  alert("XmlHttp not initialized!");
  return 0;
 }
 xmlHttp.onreadystatechange = responseHandler;
 xmlHttp.open("GET", formUpd.url, true, userName, userPassword);
 xmlHttp.send(null);

the GetXmlHttpObject() function is shown below:

function GetXmlHttpObject() { //init XMLHttp object
 var xmlHttp=null;
 try {
  xmlHttp=new XMLHttpRequest(); // Firefox, Opera 8.0+, Safari
 }
 catch (e) {
  try {   // Internet Explorer
   xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
  catch (e) {
   xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
 return xmlHttp;
}

Now, this works fine for a page update but I need to send data to the server, not only to update the page.

I'm looking for AJAX since I want to avoid a page refresh that I can't avoid using a simple FORM.

So my question is: How can I send data to my RL-ARM 4.12 with AJAX?
Any example available online?
Any tutorials?
Perhaps is there a simple way to do it using the

xmlHttp.send();

function?

Any help would be appreciated!

Thank you

Paolo.