请问下面的广告如何拦截？

<tbody><tr><td><!--画中画广告开始--><table align="left" border="0" cellpadding="0" cellspacing="0">
	<tbody><tr><td>
<!--画中画广告开始-->
<span><iframe style="display: none;" marginheight="0" marginwidth="0" src="http://273.adsina.allyes.com/main/adfshow?user=AFP6_for_SINA%7Cnews%7CchinaPIP&amp;db=sina&amp;border=0&amp;local=yes" frameborder="0" height="300" scrolling="no" width="360">
&lt;SCRIPT LANGUAGE="JavaScript1.1" SRC="http://273.adsina.allyes.com/main/adfshow?user=AFP6_for_SINA|news|chinaPIP&amp;db=sina&amp;local=yes&amp;js=on"&gt;&lt;/SCRIPT&gt;
&lt;NOSCRIPT&gt;&lt;A HREF="http://273.adsina.allyes.com/main/adfclick?user=AFP6_for_SINA|news|chinaPIP&amp;db=sina"&gt;&lt;IMG SRC="http://273.adsina.allyes.com/main/adfshow?user=AFP6_for_SINA|news|chinaPIP&amp;db=sina" WIDTH=360 HEIGHT=300 BORDER=0&gt;&lt;/a&gt;&lt;/NOSCRIPT&gt;</iframe></span>
<!--画中画广告结束-->
</td></tr></tbody></table><!--画中画广告结束-->
</td></tr>
<tr><td><!-- 画中画下文字链广告（从上至下顺序为01，02，03，04文字，需加class=a01）-->
<table border="0" cellpadding="0" cellspacing="0" width="360">
<tbody><tr><td height="9"></td></tr>
<tr><td>
	<table background="http://image2.sina.com.cn/dy/images/xfrd_02.gif" border="0" cellpadding="0" cellspacing="0" width="360">
	<tbody><tr><td rowspan="2" height="45"><img src="http://ad4.sina.com.cn/shc/xfrd_01.GIF" border="0" height="45" width="70"></td><td style="padding-top: 4px; padding-left: 5px;" width="286">

	<!--F70BB90BB6BA--><!--nwy/uc/A-->
<script language="JavaScript">

ad1= "CBD珍藏阔邸";
link1= "http://sina.allyes.com/main/adfclick?db=sina&bid=51113,78860,78932&cid=0,0,0&sid=74275&advid=3245&camid=11464&show=ignore&url=http://www.worw.com/dqgj/";
//左上

ad2= "庭院盛宴压轴奥北";
link2= "http://sina.allyes.com/main/adfclick?db=sina&bid=51176,78945,79017&cid=0,0,0&sid=74349&advid=3197&camid=11490&show=ignore&url=http://www.wushuang.com.cn/";
//右上

ad3= "维吉奥商业招商！";
link3= "http://sina.allyes.com/main/adfclick?db=sina&bid=48822,76026,76086&cid=0,0,0&sid=71862&advid=2913&camid=11108&show=ignore&url=http://www.bjoct.com/";
//左下

ad4= "雷克萨斯LEXUS ES350";
link4= "http://sina.allyes.com/main/adfclick?db=sina&bid=51004,78737,78809&cid=0,0,0&sid=74165&advid=2300&camid=11446&show=ignore&url=http://ad.cn.doubleclick.net/clk;40667187;13727091;m?http://www.es350.com.cn";
//右下

//浏览器类型变量
var InternetExplorer = navigator.appName.indexOf("Microsoft") != -1;
//ie内容
function IEad(){
	adCode = '<OBJECT classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" WIDTH="280" HEIGHT="40" id="ad_note" ALIGN=""><PARAM NAME=movie VALUE="http://image2.sina.com.cn/dy/zwyhzh/ad_note.swf"> <PARAM NAME=quality VALUE=high> <PARAM NAME=wmode VALUE=transparent> <PARAM NAME=bgcolor VALUE=#FFFFFF> <param name="swLiveConnect" value="true"> '
	+' <EMBED src="http://image2.sina.com.cn/dy/zwyhzh/ad_note.swf" quality=high wmode=transparent bgcolor=#FFFFFF  WIDTH="280" HEIGHT="40" NAME="ad_note" ALIGN="" TYPE="application/x-shockwave-flash" PLUGINSPAGE="http://www.macromedia.com/go/getflashplayer" swLiveConnect="true"></EMBED></OBJECT>'

	document.write(adCode);
	
	document.getElementById('ad_note').SetVariable("ad1", ad1);
	document.getElementById('ad_note').SetVariable("ad2", ad2);
	document.getElementById('ad_note').SetVariable("ad3", ad3);
	document.getElementById('ad_note').SetVariable("ad4", ad4);
	
	document.getElementById('ad_note').SetVariable("link1", link1);
	document.getElementById('ad_note').SetVariable("link2", link2);
	document.getElementById('ad_note').SetVariable("link3", link3);
	document.getElementById('ad_note').SetVariable("link4", link4);

}
//ns内容
function NSad(){

adCode = '<table width=286 border=0 cellpadding=0 cellspacing=0>'
	+'<tr height=20><td width=143 style="padding-top:5px;padding-left:5px"> <img src=http://image2.sina.com.cn/dy/images/xfrd_04.gif width=7 height=7> '
	+'<a href='+ link1 +' class=a01 target=_blank>'+ ad1 +'</a>'
	+'</td><td width=143 style="padding-top:5px;"> <img src=http://image2.sina.com.cn/dy/images/xfrd_04.gif width=7 height=7> '
	+'<a href='+ link2 +' class=a01 target=_blank>'+ ad2 +'</a>'
	+'</td></tr>'
	+'<tr height=20><td style="padding-left:5px"> <img src=http://image2.sina.com.cn/dy/images/xfrd_04.gif width=7 height=7> '
	+'<a href='+ link3 +' class=a01 target=_blank>'+ ad3 +'</a>'
	+'</td><td> <img src=http://image2.sina.com.cn/dy/images/xfrd_04.gif width=7 height=7> '
	+'<a href='+ link4 +' class=a01 target=_blank><SPAN ID="oSpan" UNSELECTABLE="on" >'+ ad4 +'</span></a></td></tr></table>'

document.write(adCode);
}

//主过程
if(InternetExplorer == true){
	IEad();
}else{
	NSad();
}
</script><table border="0" cellpadding="0" cellspacing="0" width="286"><tbody><tr height="20"><td style="padding-top: 5px; padding-left: 5px;" width="143"> <img src="http://image2.sina.com.cn/dy/images/xfrd_04.gif" height="7" width="7"> <a href="http://sina.allyes.com/main/adfclick?db=sina&amp;bid=51113,78860,78932&amp;cid=0,0,0&amp;sid=74275&amp;advid=3245&amp;camid=11464&amp;show=ignore&amp;url=http://www.worw.com/dqgj/" class="a01" target="_blank">CBD珍藏阔邸</a></td><td style="padding-top: 5px;" width="143"> <img src="http://image2.sina.com.cn/dy/images/xfrd_04.gif" height="7" width="7"> <a href="http://sina.allyes.com/main/adfclick?db=sina&amp;bid=51176,78945,79017&amp;cid=0,0,0&amp;sid=74349&amp;advid=3197&amp;camid=11490&amp;show=ignore&amp;url=http://www.wushuang.com.cn/" class="a01" target="_blank">庭院盛宴压轴奥北</a></td></tr><tr height="20"><td style="padding-left: 5px;"> <img src="http://image2.sina.com.cn/dy/images/xfrd_04.gif" height="7" width="7"> <a href="http://sina.allyes.com/main/adfclick?db=sina&amp;bid=48822,76026,76086&amp;cid=0,0,0&amp;sid=71862&amp;advid=2913&amp;camid=11108&amp;show=ignore&amp;url=http://www.bjoct.com/" class="a01" target="_blank">维吉奥商业招商！</a></td><td> <img src="http://image2.sina.com.cn/dy/images/xfrd_04.gif" height="7" width="7"> <a href="http://sina.allyes.com/main/adfclick?db=sina&amp;bid=51004,78737,78809&amp;cid=0,0,0&amp;sid=74165&amp;advid=2300&amp;camid=11446&amp;show=ignore&amp;url=http://ad.cn.doubleclick.net/clk;40667187;13727091;m?http://www.es350.com.cn" class="a01" target="_blank"><span id="oSpan" unselectable="on">雷克萨斯LEXUS ES350</span></a></td></tr></tbody></table>
</td><td rowspan="2" width="4"><img src="http://image2.sina.com.cn/dy/images/xfrd_03.gif" height="45" width="4"></td></tr>

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