Ajax code is not working

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Ajax

jQuery

struts

hi,

when I am running my site in my system where i have put my war file, that time i am getting all city according to the state but when I am accessing my sites through URL from other system that time my code is not working .

Here below is my code please have a look and help me ,

Jsp
<html:select property="stID" styleClass="textbox" önchange="collegemasterURL('collegemaster.do?method=city&stID='+ this.value);">



Ajex File :

function collegemasterURL(url) {
	
	if (typeof XMLHttpRequest != "undefined"){
        xmlHttp= new XMLHttpRequest();
        }
      else if (window.ActiveXObject){
        xmlHttp= new ActiveXObject("Microsoft.XMLHTTP");
        }
      if (xmlHttp==null){
      alert("Browser does not support XMLHTTP Request") ;
      return;
      } 
      xmlHttp.onreadystatechange = processStateChange;
      xmlHttp.open("GET", url, true);
      xmlHttp.send(null);



function processStateChange() {
	if (req.readyState == 4) { // Complete
		if (req.status == 200) { // OK response
			
			var returnElements = req.responseText.split("||");
			//Process each of the elements 	
			for ( var i = 0; i < returnElements.length; i++) {
				if (returnElements[i] != "") {
					valueLabelPair = returnElements[i].split(";");
					//alert(valueLabelPair[1]+''+ valueLabelPair[0]);
					document.getElementById('cntID').options.length = returnElements.length;
					document.getElementById('cntID').options[i] = new Option(
							valueLabelPair[1], valueLabelPair[0]);

				}
			}
		} else {
			alert("Problem: " + req.statusText);
		}
	}
}