I will write it in a few minutes. This is untested, but it should do the job. I would highly suggest making this a DIFFERENT color than the search HiLite color above it. You can copy all this or download from SnitzBitz.
This mod adds text highlighting function to the editor.
1. Save the following in your forum folder, then run it from the admin console.
"dbs_highlight.asp"
Highlighter v1.0
[INSERT]
CONFIG_NEW
(C_VARIABLE,C_VALUE)#('STRHIGHLIGHTER','yellow')
[END]
2. Save this in your images folder:
"icon_editor_highlight.png":
3. Make the following changes to forum files:
"admin_config_colors.asp"
"config.asp"
"inc_code.js"
"inc_func_common.asp"
"inc_func_posting.asp"
"inc_iconfiles.asp"
"inc_post_buttons.asp"
"pop_forum_code.asp"