To use this, it's best to use both of the files included in the .zip file (overwrite your current admin_config_colors.asp file with the one in the .zip file)
I just looked again and the line that you are referring to about the strPageBGImage is not in the admin_config_colors.asp file that is in the .zip file referenced in this thread. It's not part of a standard install of Snitz Forums 2000 v3.1sr4 either.
You must be using a modified version of the forum.
The file I am referring to is the one in the pop_color_chart.zip. As you say the one in the original colortemplates.zip is fine. The only thing I could see that was different between the two was the strPageBGImage.
Sorry if I was rather vague
------- Eagles fly!, but weasels don't get sucked into jet engines.