[nico_swd]

Your form is somewhat messed up. I need the names of the input fields, and I need to know which values you want to send to your PHP script.

Here a raw example.

<script type="text/javascript">

function create_req_object()
{
	var req = false;
	
	if (window.XMLHttpRequest)
	{
		req = new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		var msp = new Array('Microsoft', 'Msxml2');
		
		for (var i in msp)
		{
			try
			{
				req = eval('ne' + 'w Act' + 'iveXObj'+ 'ect(msp[i] + ".XMLH'+ 'TTP");');
			}
			catch(e)
			{
				continue;
			}
		}
	}
	
	return req;
}

function submit_form(form)
{
	var http = create_req_object();
	
	if (!http)
	{
		return true;
	}

	http.open('POST', form.action);
	http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
	http.onreadystatechange = function()
	{
		if (http.readyState == 4 && http.status == 200)
		{
			alert("The data has been submitted.");
		}
	}
	http.send('do=dopredict&foo='+ form.fieldname.value +'&bar='+ form.otherfield.value);
	return false;
}

</script>
<form action="predictions.php" method="post" onsubmit="return submit_form(this);">
<input type="hidden" value="do"><input type="hidden" value="dopredict">
then I have the different fields which are dynamic
<input type=text value=Home>
<input type=text value=Away>
<input type="submit">
</form>

What this code would do is, if someone clicks submit, it will send the data via XMLHttpRequest to the PHP script, and show an alert once that happend.

You have to edit this line.

http.send('do=dopredict&foo='+ form.fieldname.value +'&bar='+ form.otherfield.value);

These are the variables that are sent to the script. You just have to change the names and maybe add more if necessary. it will send the data via POST, that means you can receive it's value with the $_POST or $vbulletin->GPC variables.

So if you'd do a print_r() for the example above you'd get something like this

Array
(
      do => dopredict,
      foo => (value of your field),
      bar => (value of your field),
)

Hope that helps.