急！求助：怎样才能屏蔽JavaScript类型的弹出广告

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                        style="BORDER-RIGHT: #455690 1px solid; BORDER-TOP: #a6b4cf 1px solid; Z-INDEX: 99999; LEFT: 65px; VISIBILITY: hidden; BORDER-LEFT: #a6b4cf 1px solid; WIDTH: 255px; BORDER-BOTTOM: #455690 1px solid; POSITION: absolute; TOP: 622px; HEIGHT: 159px"> 
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                            valign=center width="88%" height="20">&&&&&&&&您有新短消息：</td>
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                            valign=center align=right width=19> 
          <div align="center"><span title=关闭 
                              style="FONT-WEIGHT: bold; FONT-SIZE: 12px; CURSOR: hand; COLOR: red; MARGIN-RIGHT: 4px" 
                              onClick="javascript:closeDiv();"><font color="#003399">×</font></span> 
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<div align="center"><strong><a 
                              href="http://www.x678.com" 
                              target=_blank><font color="#FF0000">广告：激情裸女现场视屏</font></a></strong><br>
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