Hide comments/all but first post in a thread

[SnitchSeeker]

Hello,

One of the forums on my site is set up as a news forum. I want it to work like hpana.com and other sites where all comments (posts) are hidden by default, but can be accessed by a link. Or even better that they are default hidden for guests, but that members can choose if they want them shown by default or not.

Is there any such mod? It sounds to me like it wouln't be too much work for somebody who knows what they are doing. Anybody able to help me?

Here's the forum in question: http://www.snitchseeker.com/harry-potter-news/

Can somebody move this to the mod-requests forum? Please!