<script type="text/javascript">    if(navigator.userAgent.indexOf("MSIE")>0) 
    { 
        <SCRIPT src="js/qq.js" type="text/javascript"></SCRIPT>
    } 
    if(isFirefox=navigator.userAgent.indexOf("Firefox")>0)
    { 
        <SCRIPT src="images/qq/Service.htm"></SCRIPT>
    } 
   </script>加载脚本 这样为什么不行呢