function update() {
  if (request.readyState == 4) {
    if (request.status == 200) {
      /* Get the response from the server */
      var response = request.responseText;
      var array = response.split("|");
      var alertNumber = array[0];
      var alertText = array[1];
      if (alertNumber == "1") {
      window.location = alertText;
      } else {
      alert(alertText);
      document.getElementById("continue").disabled=false;
      }
     } else {
      alert("Error! Request status is " + request.status);
    }
  }
}

function process() {
   document.getElementById("continue").disabled=true;
   var firstname = document.getElementById("firstname").value;
   var lastname = document.getElementById("lastname").value;
   var employer = document.getElementById("employer").value;
   var address = document.getElementById("address").value;
   var city = document.getElementById("city").value;
   var state = document.getElementById("state").value;
   var zip = document.getElementById("zip").value;
   var phone = document.getElementById("phone").value;
   var email = document.getElementById("email").value;
   var comments2 = document.getElementById("comments2").value;
   var url = "addresschange2_do.php";
   request.open("POST", url, true);
   request.onreadystatechange = update;
   request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
   request.send("firstname=" + escape(firstname) + "&lastname=" + escape(lastname) + "&employer=" + escape(employer) + "&address=" + escape(address) + "&city=" + escape(city) + "&state=" + escape(state)  + "&zip=" + escape(zip) + "&phone=" + escape(phone) + "&email=" + escape(email) + "&comments2=" + escape(comments2));        
}