Access server-side Java code via Ajax

We are trying to access our server-side Java code via Ajax, so that we can call some of our server methods on certain browser actions (i.e. loading/unloading) but unfortunately the code doesn't seem to be connecting up.  At the moment, we have a server side function which will write out to a file, and we want to access this.  The code is in a file called admin, and the code to access it is as follows:

var path= "http://ourServerIP/pathToOurClassFiles";
var url= path +"/admin?act=runningTime";
var xmlHttp;
if (window.ActiveXObject) {
      xmlHttp  = new ActiveXObject("Microsoft.XMLHTTP");
} else if (window.XMLHttpRequest) {
      xmlHttp = new XMLHttpRequest();
} else {
  if (xmlHttp.readyState==4 && xmlHttp.status==200)
        document.getElementById("running_time").innerHTML=": "+xmlHttp.responseText;

The html file calling this script resides on a different server from the server-side java files, so we can't have a relative path.  Is the basic logic of this code correct, or is something missing to make this code fully connect - if so, what is it?
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>Is the basic logic of this code correct, or is something missing to make this code fully connect - if so, what is it?

Why it don't work :

You may use a proxy on the server delivering the page doing the ajax call to load the page on the other servers

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