subdomain cloaking

[Canon]

Hey, i have a question!!! so pelase answer kindly :P

anyways, right now i have subdomains such as

forums.keshavjee.net

when accessed, users are pointed to keshavjee.net/forums

I am wondering how to keep the domain cloaked as forums.keshavjee.net

So, for example...

forums.keshavjee.net would go to http://keshavjee.net/forums/

I want the links of the forum to be viewed as, for example,

forums.keshavjee.net/index.php?board=14.0

I hope that made sence.