How do you exclude categories from navigation in wordpress?

I've tried putting this code in header.php: <?php wp_list_categories(‘title_li=&include=3,5,7,12′);?> But it screwed everything up and there's no code in MY header.php to replace what I wrote above with? Is there a plugin for this that actually works? I don't seem to have the code in my... show more I've tried putting this code in header.php: <?php wp_list_categories(‘title_li=&include=3,...

But it screwed everything up and there's no code in MY header.php to replace what I wrote above with? Is there a plugin for this that actually works? I don't seem to have the code in my header.php to replace with the normal code that seems to work for every body else.
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