String Replacement in files

[cleansedbb]

I have several log files which are in this format:

logfile1.log

<script LANGUAGE=&quot;Javascript&quot;> if (parent.frames[2].ignore.indexOf(&quot;|NickName|&quot == -1) {document.write('<font color=color><B><big>NickName</big></B> - Message</font><br>'); } </script>

I tried a

$line1 = &quot;<script LANGUAGE=&quot;Javascript&quot;> if (parent.frames[2].ignore.indexOf(&quot;|&quot;;
$line2 = &quot;|&quot == -1) {document.write('&quot;;
$line3 = &quot;'); } </script>&quot;;

$mystr = strtr($addr, &quot;$lin1&quot;, &quot; &quot;
$mystr = strtr($addr, &quot;$lin2&quot;, &quot; &quot;
$mystr = strtr($addr, &quot;$lin3&quot;, &quot; &quot;

all I get is the first < being changed to a square block?

also how would I replace the NickName in |Nickname| ?
would I check for that first then remove the rest of the javascript strings?

Thanks for any help you can give me.