could it be in a single xml product instead of manually changing template ?

If you want to write that, feel free to post it. I took a quick stab at writing it as a plugin, and couldn't get the syntax right, but if you have the time, then go for it.

One question: can it be arranged that clickable prefixes with images on hover change background. Can this be arranged with CSS

Like for example reply buttons in vB4.0

You can do that with css, yes. You're going to have to play with it a bit and remember that if you use an id, you'll need to make it unique (so append the thread id to the end of it, or something like that).

Thanks Lymme nice one
Tagged for future use

this is great!

and...how to search all threads with an specific prefix?
i mean..i want to add a button wich says "all threads with xx prefix"..the user clicks there and then he will be able to see all threads with that prefix on all forums/subforums

This should be a standard feature .

I think you would have to make the links not include the forumid in them if you wanted threads in any forum that have that prefixid.

so how should be the code? :s

sorry, im very bad to understand programming :(

Sorry, I was wrong. I just tried this without a forumid and it gives me an error (invalid forum specified). I guess you need to specify a forumid.