Probably a stupid question, but I can't find out where the image paths are stored for the graphics (such as search.gif), and can't find any way to change the paths in the theme config. Basically, if you look at my site here, you will see that the search icon looks rather ugly and doesn't suit it. I've uploaded a new search.png to the same directory, and I want it to point to that image instead.
Likely a major n00b question. I wish I had more experience with this stuff.