Stop fake urls

[marcel5w]

I've had some spambots invade my forums posting fake URLs which look like:

www.youtube.com/blablabla

But in fact go to a completely different site altogether. How can I disable this and have the post always show the real URL?

(Spambots have been deleted, but I still want to stop anybody from doing this).

[MarkFoster]

Many vbulletin sites has been spammed over the past two weeks, i have gotten about 40 of em.