[Zope] Changing 'standard_html_header' has no effect

I am using Zope-2.1.6. I modified standard_html_header thinking that it will let me customize my website but it had no effect at all. I tried everything, stopping zope, getting out of netscape and then restarting. I feel very frustrated. Can some one help. Thanks, -- sudhir sudhir@earthling.net