CSS mit Javascript valide einfügen

[Elias]

Hallo

Ich füge im Head für Browser mit aktiviertem Javascript eine extra CSS-Datei ein welche bestimmte Werte aus der Gesamt-CSS überschreibt.
Und zwar so:
<script type="text/javascript">
document.write('<link rel="stylesheet" type="text/css" href="no_js.css">');
</script>

Funktioniert, ist aber nicht valide (XHTML1 - transitional).

Der Validator schreibt:

document type does not allow element "link" here.
...="stylesheet" type="text/css" href="menue.css">');

The element named above was found in a context where it is not allowed. This could mean that you have incorrectly nested elements -- such as a "style" element in the "body" section instead of inside "head" -- or two elements that overlap (which is not allowed).

One common cause for this error is the use of XHTML syntax in HTML documents. Due to HTML's rules of implicitly closed elements, this error can create cascading effects. For instance, using XHTML's "self-closing" tags for "meta" and "link" in the "head" section of a HTML document may cause the parser to infer the end of the "head" section and the beginning of the "body" section (where "link" and "meta" are not allowed; hence the reported error).

Wie kann ich das valide lösen?

Danke, Elias