title: Issue with ajax login
body: <p>I have a ajax login system on a website. username and password submitting using post method. but randomly username and password showing in URL with a query string like <a href="http://www.example.com?username=abc&amp;pass=123456" rel="nofollow noreferrer">http://www.example.com?username=abc&amp;pass=123456</a>. 
  why this is happening ? below is the code</p>
  
  <pre><code>$(document).ready(function() {
      var $body = $('body'),
          $content = $('#content'),
          $form = $content.find('#loginform'); 
          $("input .logingform").uniform(); 
          $form.wl_Form({
              status:false,
              onBeforeSubmit: function(data){
                  $form.wl_Form('set','sent',false);
                  if(data.username || data.password){
                      $.ajax({
                          type: "POST",
                          url: $form.attr('action'),
                          data: 'username=' + data.username + '&amp;password=' + data.password + '&amp;rememberme=' + data.rememberme + '',
                          success: function(msg) {
  
                          }
                      });
                  }else{
                      $.wl_Alert('Please provide something!','info','#content');
                  }
                  return false;
  
              }                             
          }); 
  });
  </code></pre>