Have you seen this?

I do't know why, but whenever I view source of a page, I see this code on the pages:

This is in the header:
<script language="JavaScript">
<!--

function SymError()
{
return true;
}

window.onerror = SymError;

var SymRealWinOpen = window.open;

function SymWinOpen(url, name, attributes)
{
return (new Object());
}

window.open = SymWinOpen;

//-->
</script>

<script type="text/javascript">
<!--
var SESSIONURL = "";
var IMGDIR_MISC = "images/misc";
// -->
</script>




This appears after the </html>:
<script language="JavaScript">
<!--
var SymRealOnLoad;
var SymRealOnUnload;

function SymOnUnload()
{
window.open = SymWinOpen;
if(SymRealOnUnload != null)
SymRealOnUnload();
}

function SymOnLoad()
{
if(SymRealOnLoad != null)
SymRealOnLoad();
window.open = SymRealWinOpen;
SymRealOnUnload = window.onunload;
window.onunload = SymOnUnload;
}

SymRealOnLoad = window.onload;
window.onload = SymOnLoad;

//-->
</script>


I have no idea why this appears or if it is bad or is causing any problems. Any ideas?

chances are its your symnantec norton security software, i think its part of the spam blocker or w/e type of security it has

it is indeed Norton. the chances are many of your site's users will have it, in which case never rely on any scripts which may get blocked by it. if you do, a great meany of your customers won't be able to use your site, which is hardly fair since you cannot tell/ask them to disable Norton.