Guys, look at the code. It really isn't hard to figure out.
See where it says /some_path/clear.gif? Just replace that with any other image url, and that's it. For example, vbulletin substitues icon1 when you enable an option. So you can change clear.gif to that icon1.gif. I think that's a lot of hint.
If you guys don't figure it out, ask again, I'll help you out.
P.S. See, I'm teaching you how to mess with other people's code too, so later on you'll be creating your own hacks.