MyBB Community Forums

Okay if you visit my freinds site;

http://www.totalrs.net/

A pop-up box comes up on screen asking guests to login or register

Is there such a plug-in available?

I get alot of guests but need to up my members

No there is not.

Ah annoying

Is there any plugin which could potentially get people to register?

I think they are called Flash Ads. You can make them yourself (I don't know, how, Its through a website I think) and Integrate it into your sites Template.