Best find & replace tool, for big jobs?

Looking for one that can replace several lines of code in about 5K html pages.
Seen i still had the old seccounter in several of my pages..

Code looks like this ... I just want to chop it out of 5K pages.

<!-- Begin Sexcounter -->
<div style="position:absolute;">
<script language="javascript" type="text/javascript"><!--


sw=screen.width+'x'+screen.height;
bd=screen.colorDepth;
dt=new Date();dt=dt.getTimezoneOffset()/-60;
loc=escape(document.location);
re=escape(parent.document.referrer);re=(re=="undef ined"||re=="")?"bookmark":re;
req="id="+5986+"&loc="+loc+"&re="+re+"&tz="+dt+"&s w="+sw+"&bd="+bd;
document.write('<img width=4 height=4 src="http://cs.sexcounter.com/cs/?'+req+'">');
//--></script>
<noscript><img src="http://cs.sexcounter.com/cs/?id=xxxx" width="4" height="4"></noscript>
</div>
<!-- End Sexcounter -->