replace variables in style with xml

[create365]

That is what I asked. Thank you for your answer, it helped a lot.

Last question, how is it done if there is no template hook to use at this specific place, and there is a need to insert own template variable/show something there?

EDIT:
Okay, found something like:

$vbulletin->templatecache['threadadmin_editthread'] = str_replace('<div class="blockrow">
				<label for="notes">', '<div>\' . $extrathreadfields . \'</div><div class="blockrow">
			<label for="notes">', $vbulletin->templatecache['threadadmin_editthread']);

So that is what I wanted. Not a nice way, so I wanted to ask if there is other option to achieve this. But apparently there is not.