Thank you all for your patience. I posted earlier here about a problem I was having with the Weight Editor. ( buttons not functioning correctly .etc )
I'm pretty sure that the problem lies in my pathetic video card ( 32 mb ).
Still, while I'm at it though, I'd like to ask why it is that some of my bones will have more than one color when I'm weight painting .
In the Weight Editor the bone is blue, but the panel on the left of the screen shows it as yellow, and when I select it solo, it is shown white.