Does IE treat backgrounds as if it were an actual image?

I tested it on my header (Home Submit )
They both have bottom: 0, position: absolute;

In IE its lower, in FF its higher, I also noticed this true in
another project Ive done. Is there a way around this?

Ive had this problem a few times, any articles anyone knows about on it?
I dont know what to look up.. Difference between IE/FF floats?

i just noticed them link borders are off haha. wonder if thats a bug too or
if my IE is just on crack