.htaccess poblems

[iusevb]

I am trying to fix the URL so when i type in my website, it goes to the "home" page on my forum. I put this into my .htaccess folder:

RewriteEngine On
RewriteBase /
RewriteRule ^index.(.*)?$ http://mywebsite.com/forums/ [r=301]

It didnt work. Is this the correct code or is there something I need to change in my vBulletin control panel options?

Any help would be great. Thanks!