[iojam]

Tom,

after ConqSoft's (absolutely correct) answers, I can only add:

the script submits your sitemap to Google, and NOT to your webmaster account, because there is NO association between your site and your google webmaster account. Within your account you can track multiple sitemaps (including sites that you do not own!) AND vice versa - there may be several accounts that track the same sitemap.

EDIT: One other thing i was wondering, the google FAQ says that you should have the index file in the uppermost directory or your site, as my site uses a portal and my forums are in www.whatever.com/forums will this prevent anything above the forums from getting crawled (i.e. my photo gallery, tutorials sections etc?)

Sitemap cannot prevent crawling the site. The "uppermost directory" term means that any URL that link to the upper folder and is included into sitemap will be ignored, which is not the case - all urls created by vBSEO Sitemap Generator will point to your forums/ directory.