Set styleid in custom pages - cookie?

[Ronny]

I've a question about the vBulletin template system, styles and custom pages. Right now i'm settin the style for any of my custom pages with myphpfile.php?styleid=1 (2, 3, ...). For this to work i have to activate the style dropdown box for all users in the admincp.

There must be a way to set the style i wanna use on any custom page inside my php code before or after i include the vBulletin global.php - like a function call with the style id or something else. I didn't found anything yet that could me lead to this. I can set different styles for any forum but i am unable to find any code in the default vBulletin php files about setting styleid or something like that nor any function.

Thanks