You said you could use this code:
HTML Code:
<if condition="$bbuserinfo['usergroupid'] == 1">
<meta HTTP-EQUIV="REFRESH" content="0; url=www.mysite.com/website/blah">
</if>
And I was suggesting you change the condition:
HTML Code:
<if condition="$show['guest'] AND THIS_SCRIPT == 'index'">
<meta HTTP-EQUIV="REFRESH" content="0; url=www.mysite.com/website/blah">
</if>
The condition I suggested basically says If the user is a guest and you are on the (vbulletin) index page, do this.