[SiteTalkZone]

Thanks kh99,
I did following your instruction and found location need to hook for header template. That is parse_templates

However, I have not yet found solution for the first issue.

----------------------------------------------------------------------------------------
I tried to hook into parse_template location, it has an error when I used following command:

$vbulletin->templatecache['header']  = "New Content's Header";

The error is:

Parse error: syntax error, unexpected T_LNUMBER in C:\pathtoforum\global.php(833) : eval()'d code on line 3