Parsing comments in XSL

I'm trying to parse an element in XSL that contains a comment in it's body;

<script type="text/javascript">
<!--
var NS6 = ((document.getElementById) &&(navigator.userAgent.indexOf('Netscape')!=-1)) ? true : false;
var NS4 = (document.layers) ? true : false;
var IE4 = (document.all) ? true : false;
//-->
</script>

I don't seem to be able to access the text within the script element though. If I try and use "script/text()" I get nothing back. Does anyone know if it is possible to access this text at all or is it being blocked by the XSL "engine" because it thinks it's a comment?

Thanks,
Giles