Weight painting...

hey everyone I'm being frustrated to death and I was wondering if
someone could take a look at my file and help me figure out what I'm
doing wrong.

In the help wanted section in the files I put the file:
Frog_man3.blend. I am following the intro to character animation
tutorial in the wiki and keep running into trouble in the weight
painting section.

My problem is that while weight painting the left side, specifically
the hand, somehow the right side gets assigned to the left's bones.
Now it's not because of some weird angle I've been painting. I
assigned the verts using 7 and ctrl 7. I've cleared and reassigned the
verts and I have the same problem again and again. The other weird
thing I've noticed is that the pinkie on the right hand is assigned
correctly but when I rotate the bones up and down it moves behind...

It's very weird and I have no idea what I've done wrong. Any help
would be very much appreciated.

thanks