unable to connected to next page

hi,
i m new to ajax......i m learning now...in my project i had to use ajax....i wrote ajax in it if i click login,it should go to other page and validate the login and username....i tried a lot.i m unable to get it....can anyone help me out....the code is as follows....

var reqXML;
        var url;

//Create our function to start the request
      function VerifyLogin(){

//inform there is an action!
        document.getElementById("spanLog").innerHTML = "<span style='color:green'> Checking Information</span>";

//Grab our form field values
        var strName = document.Form1.username.value;
        var strPass = document.Form1.pswd.value;

//Make the URL for the request
        url = "t5login.jsp" + strName + strPass + ".html";

//determine if the browser is Moz, FF, NN, Op
        if (window.XMLHttpRequest){
          reqXML = new XMLHttpRequest();            //set the request
          reqXML.onreadystatechange = LoginUser;    //function to call on each set
          reqXML.open("GET", url, true);            //set the page to request
          reqXML.send(null);                        //initialize the request
        }
        //ActiveX - can we say IE?
        else if(window.ActiveXObject){
          //Create our RequestObject
          reqXML = new ActiveXObject("Microsoft.XMLHTTP");
          if(reqXML){
            reqXML.onreadystatechange = LoginUser  //function to call on each step
            reqXML.open("GET", url, true);         //set the page to request
            reqXML.send(null);                     //initialize the request
          }
        }
        else{  //I do not support this so I need to do something!
           window.location.href = url;
        }
      }

function LoginUser(){

//Look to see if the request is in the 4th stage (complete)
        if(reqXML.readyState == 4){
          //Make sure that we get a sucess page status
          if(reqXML.status == 200){
            //change our location
            window.location.href = url;
          }
          //For all of the wrong error pages here
          else{
            document.getElementById("spanLog").innerHTML = "<span style='color:red'> Error: username and password is not correct!</span>";
          }
        }
      }
    </script>
  </head>
  <body>
    <form name="Form1" onsubmit="VerifyLogin();return false;">
      <span style="font-family:courier">User Name: </span><input type="text" name="username"><br/>
      <span style="font-family:courier">Password:  </span><input type="password" name="pswd"><br/>
      <input type="submit" name="btnSub" value="Login" style="font-family:courier">
    </form>
  </body>
</html>

Thanks in advance..
Madhu.

Do you know what your url looks like?

url = "t5login.jsp" + strName + strPass + ".html";
Eric