Way to concentrate ?

It's difficult for me to concentrate when my computer is on and i have to do my assignment.
I usually will go onto facebook after reading for a while
and may be to the forums that I usually visit
You would say, why don't you switch it off ?
I wish I could do that too, but the problem is, I have to find articles online for my essay
and many of my assignment require online research =.=

I find it more easy to concentrate when my computer is off
is there a way to concentrate even it's on ??
arrrr>.<"
CONCENTRATE !!!!!!OMG !!!