iFrame and use of multiple styles on same domain, possible?

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I'm trying to use multiple styles but it's not working. :( When I link content within an iframe using a different style, (using, &styleid=3 for example) it changes the style to 3 on the next page that's loaded.

Is there a way to use multiple styles without effecting the default style?

So, if I want content within an iFrame displayed using a different style than the rest of my forum, can I do it without changing the users style?

THANKS for reading my issue! :)