Hi,
I have a site and I want to put a forum on it. So, if I install phpbb3 for the forum, can I

be able to change the layout as of my site. I have a vertical menu on the left on the site

and so want to keep the menu in the forum too...Can anyone help me???

Yes this is possible. The layout of the forum pages is controlled by whatever style you've decided to use, under the directory styles/style name/templates.
The one you're most likely going to want to customize is overall_template.php.

The best way might be to find a style thats similar to what you want at http://www.phpbb.com/styles/db/ and customize that.

Be warned, the biggest annoyance in developing a phpbb3 style is that it caches everything so your changes don't show up. There's probably a way to turn off caching, but I just delete tpl* from the cache directory after making changes.

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