定时关闭Alert框--http://topic.csdn.net/t/20040413/15/2959933.html#

<script   language="JavaScript">  
  var   aaa  
  function   test()  
  {  
  aaa=if0.showModelessDialog("javascript:alert();window.close();","","status:no;resizable:no;help:no;dialogHeight:30px;dialogWidth:40px;");  
  setTimeout("if0.location.reload();",1000);  
   
  }  
  </script>  
  <iframe   style="display:none"   name=if0   ></iframe>  
  <input   type="button"     value="弹出alert框,一秒后自动关闭;"   onClick="JavaScript:test()">  
  </form>