Remove wallpaper

[Jim Lemon]

Hi,
Looked at the FAQ and some of the archives. While there were a lot of 
messages about how to jazz up the background, I saw none on how to 
remove wallpaper.

1) Running Kubuntu 8.04 (I think)
2) Right clicking on the background brings up a dialog with no option to 
remove the wallpaper.
3) Using the System Settings program has an option (the leftmost button 
at the bottom of Appearance | Theme Manager), but it appears to be 
disabled. If I click on any of the other buttons, I get a "This 
configuration section is already opened in System Settings".

Is there just a configuration file I can edit rather than wade through 
all the GUI stuff that doesn't seem to work? Thanks for any advice.

Jim