Forum Collapse/Expand icon

[halpern]

I want to replace the standard vbulleting collapse/expand arrows for the forums to "-" and "+". What file would I have to modify to do this?

[CyberAlien]

images/*/buttons/collapse_tcat.gif and images/*/buttons/collapse_tcat_collapsed.gif

[halpern]

It worked like a charm. Thank you CyberAlien.