title: Jquery Issue with validation
body: <p>I have question below
  I have profile page contains user_name ,email,city etc...
  when performing validation i will check user_name already existing or not and other regular stuff like emmail validation,integer check etc...
  My problem is user_name check is a ajax call so beofre completing the user_name check validation is completed and inserted wrong user name that already existed..how can i prevent this.</p>
  
  <p>my code is below</p>
  
  <pre><code>function doValidation()
  {   
  var err = '0' ;
  var errWebuser='0';
  if($('#FHE_0_user_name').val()!="")
      {
      alert("call check");
      errWebuser=checkWebUserName('FHE_0_user_name');
      alert(errWebuser);
      }
  $('.required input').each(function(){
      if(  ($(this).val() == '')  )
      {
          var id = $(this).attr('id');
          err = '1';
          $(this).css('border','1px solid #F00');
          appendError(id,'required');
  
      }
  </code></pre>
  
  <p>in that checkWebUserName is the ajax call</p>
  
  <p>thanks alex</p>