Script being mysteriously added to web pages when viewed with browser

Script being mysteriously added to web pages when viewed with browser

Web pages, when viewing them on my brother's computer, are being changed when his browser loads the page. This is one of the scripts being added just in front of </head>:

<script language='javascript' src='http://127.0.0.1:1025/js.cgi?pcaw&r=32662'></script>

(Note: the number after "pcaw&r=" is different for ever page visited.)

Also, at the bottom of the page this is being added just below </html>:

<script language='javascript'>postamble();</script>

We are both using the same DSL Internet connection. We both have XP home with IE 6 with the most recent security patches.

I installed the most recent verson of FireFox on his computer last night with the same result. What could be changing a Web page as it is loaded on his computer? And what security breaches could the script cause? Any idea?

I stumbled upon a post here at Dev Shed Forums that may hold the key. I found the post here:
http://forums.devshed.com/html-programming-1/error-expected-quotquot-116277.html?p=507456#post507456

According to the information found at the above post, Zone Alarm Suite may be adding the script to pages. But why in the ****ens does't the full retail version of Zone Alarm on my brother's computer insert script origination information as it did below (found at the link above)?

<!-- ZoneLabs Privacy Insertion -->
<script language='javascript' src='http://127.0.0.1:1025/js.cgi?pcaw&r=16139'></script>
<script language="JavaScript">
function getSelect(s)
{
return s.options[s.selectedIndex].value
}
function UpdateQty(item)
{
stype = "AirMail";
sCountry = "South Korea";
itemId = item.name;
newQty = item.options[item.selectedIndex].text;
document.location.href = 'cart.php?action=update_item&id='+itemId+'&qty='+newQty+'&shiptype='+stype+'&country='sCountry;
}
</script>