The little envelopes for Threads with in forums

[New Joe]

Within each forum are your threads, to the left is the little envelope icons.
These icons show (when you hold your mouse over them);
New posts
No new posts
Thread is closed
Hot thread with new posts
Hot thread with no new posts
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These things which show when the mouse is help over the envelopes aren't that important to me but I would like to be able to change the little envelope icons to some different icons, but also would like to have different icons showing for each different forums.

I have already done this from here: http://www.vbulletin.com/forum/showp...22&postcount=3
Which has given me new icons for each forum category but I'd like to do the same for the icons as I said within the forum categories for threads.

Any one can help out with this?
Sofia maybe