Ajax Rating Control

Hi,
I'm using Ajax Rating Control ... But i'm not visible the stars.. I tried this much.. Please help me out
cs:
  protected void Rating1_Changed(object sender, AjaxControlToolkit.RatingEventArgs e)         {             System.Threading.Thread.Sleep(400);             e.CallbackResult = "Update done. Value = " + e.Value + " Tag = " + e.Tag;         }
css:
  <style type="text/css">         .style1         {             font-family: "Times New Roman" , Times, serif;             text-a ...