ok guys this is really narking me off, using the following script as an AJAX form submitter, now I have used this code on other sites and it has always worked however I have two scripts that just refuse to work with it.

Code:
	function getHTTPObject() {
	  var xmlhttp;
	  /*@cc_on
	  @if (@_jscript_version >= 5)
		try {
		  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
		  try {
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		  } catch (E) {
			xmlhttp = false;
		  }
		}
	  @else
	  xmlhttp = false;
	  @end @*/
	  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
		try {
		  xmlhttp = new XMLHttpRequest();
		} catch (e) {
		  xmlhttp = false;
		}
	  }
	  return xmlhttp;
	}
	var http = getHTTPObject(); // We create the HTTP Object	
	// End XML Object Loader
	var url = "urlhereisvoid"; // The server-side script



	  
	function submitform(){
		// first check the form is complete
		ERROR = "";
		if (document.getElementById("name").value.length < 1)ERROR = ERROR + "Your name is missing.\n";
		if (document.getElementById("email").value.length < 1)ERROR = ERROR + "Your email is missing.\n";
		if (document.getElementById("comments").value.length < 1)ERROR = ERROR + "Your comments aremissing.\n";
		
		if (ERROR == ""){
	
			// dissable the button
			document.getElementById("Submit").disabled = true;
			document.getElementById("messagediv").innerHTML = "<img src=\"<? echo $websiteurl;?>images/basket_loader_green.gif\" alt=\"Please Wait Loading Data\" width=\"67\" height=\"24\" />";
			
			// grab the data from the server and do what needs to be done
			var URL = "<? echo $websiteurl;?>AJAX/testimonials_ajax.php";
			PARAMETERS = "name=" + encodeURI(document.getElementById("name").value);
			PARAMETERS = PARAMETERS + "&email=" + encodeURI(document.getElementById("email").value);
			PARAMETERS = PARAMETERS + "&comments=" + encodeURI(document.getElementById("comments").value);
			PARAMETERS = PARAMETERS + "&url=" + encodeURI(document.getElementById("url").value);
			PARAMETERS = PARAMETERS + "&Submit=Submit";
						
			// post the info to the URL
			http.onreadystatechange = testimonialsent;
			http.open('POST', URL, true);
			http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
//			http.setRequestHeader("Content-length", PARAMETERS.length);
			http.setRequestHeader("Connection", "close");
			http.send(PARAMETERS);*/

		} else {
			alert("There was an error with your submittion.\n"+ERROR+"Please check and try again.");
		}
	}
Now it finds the file on the server perfect, but it is not Posting the information :S

I setup a print_r($_POST) on there and the array is totally blank, so i used alert(PARAMETERS) to check that was correct and it is, as far as I can tell something is stopping it from posting the data and I cant find out what it is.

Everything is communicating it just aint posting the data tis very frustrating.