Savedata user details form-Javascript

function saveData()
{
var userid =document.getElementById('cboUser').value;
var userno =document.getElementById('txtUserNo').value;
var username =document.getElementById('txtUserName').value;
var passwrd =document.getElementById('txtPassword').value;
var tite =document.getElementById('cboTitle').value;
var firstname =document.getElementById('txtFirstName').value;
var lastname =document.getElementById('txtLastName').value;
var designation =document.getElementById('cboDesignation').value;
var nic =document.getElementById('txtNicNo').value;
var gender =document.getElementById('cboGender').value;
var dateofbirth =document.getElementById('txtDateofbirth').value;
var email =document.getElementById('txtEmailAddress').value;
var add1 =document.getElementById('txtAddress1').value;
var add2 =document.getElementById('txtAddress2').value;
var add3 =document.getElementById('txtAddress3').value;
var tele =document.getElementById('txtTelNo').value;

var url="user_db.php?id=savedata";
url+="&userid="+userid;
url+="&userno="+userno;
url+="&username="+username;
url+="&passwrd="+passwrd;
url+="&tite="+tite;
url+="&firstname="+firstname;
url+="&lastname="+lastname;
url+="&designation="+designation;
url+="&nic="+nic;
url+="&gender="+gender;
url+="&dateofbirth="+dateofbirth;
url+="&email="+email;
url+="&add1="+add1;
url+="&add2="+add2;
url+="&add3="+add3;
url+="&tele="+tele;

var htmlhttp_obj  = $.ajax({url:url,async:false});
alert(htmlhttp_obj.responseText);


window.location.href="users.php";





}