Chris,
For obvious reasons, I am reluctant to insert snippets of HTML here; but I hope this will be safe … I have added some quotation marks, which should invalidate the HTML punctuation.
Although I cannot explain how it got there; the mechanism for displaying your yellow background is easy to find.
If you look through the HTML for the page, you will find a "div style" instruction which says "="background-color: rgb(255, 255, 191); "
255, 255, 191 is the yelllow colour that you are "using" … and this instruction appears to be exclusive to threads that contain your posts.
MichaelG.
.
Note:
in Safari, there is a "View Source" menu item
in IE, press "F12"
in Firefox there is, I believe, something rather clever.
Edited By Michael Gilligan on 17/11/2012 08:18:37