$(document).ready(function() {
  	
    $('#usernameLoading').hide();
  	$('#username').blur(function(){
  	  $('#usernameLoading').show();
        $.post("_check_username.php", {
          username: $('#username').val()
        }, function(response){
          $('#usernameResult').fadeOut();
          setTimeout("finishAjax('usernameResult', '"+escape(response)+"')", 400);
        });
      	return false;
  	});
  	
});
  
function finishAjax(id, response) {
    $('#usernameLoading').hide();
    $('#'+id).html(unescape(response));
    $('#'+id).fadeIn();
} //finishAjax