Plugin for specific styleid

[gothicuser]

Been trying to write a plugin that will have effect on only one (or only) style installed.
I have tried

PHP Code:

if ($styleid == 1){
Code
} 


No good
I also tried

PHP Code:

if ($vbulletin->userinfo[styleid]==1)
{code} 


No good
I am missing something, anybody have suggestions pretty please.

p.s. another thing, should the plugin run at 'parse_templates' or 'style_fetch'. The code is

PHP Code:

$vbulletin->templatecache['footer'] = $vbulletin->templatecache['jqt_suite_footer']; 


and yes, I am rendering and caching the template first.