The white background isn't stretching the full length of the floats, and the surrounding images (the ones with the glow) aren't lining up properly with that code.
For one thing remove the border I set on #m (that was just to play around with) and then on "#ctn" add overflow:hidden; to contain the floated columns
I updated the link (sidelinesvictoria.com/2_/) with the newest ver and took a screenshot of it in case of mis communication lol. I think it's better than before though due to the fact that IE & firefox both have the same bugs.
(picture of footer / bottom of page)
It's too late to edit but I found the problem. I had to add overflow: hidden; to #mM.
What I posted was working locally (I could see what you were seeing) so I don't know where we got miscommunication but I'm glad everything is working now