Referral problem on non-vb-page

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My problem looks as follows:

We have a domain ... it's named www.sphex.net ... and we have our vBulletin-Board ... on www.sphex.net/newzones

Most of the times if anybody makes a link to us he links to www.sphex.net ... the main page instead of the boards homepage.

So in e.g. vBstats the referrer is www.sphex.net ... instead of the real origin. Also so referral system won't properly, i'm afraid.

So what can i do to solve this? One of my ideas is to put a part of vBulletin-Code into the index.html on www.sphex.net ... the part which will vBulletin cause to notice somebody has arrived.

But i don't know which part it is.

So if anybody knows what i need ... or has an even better idea ...