SOLDIERX.COM Nobody Can Stop Information Insemination

Cygnum writes: This one should be pretty simple:
You've been blinded an put in a dark room where YOU CANNOT SEE ANYTHING. In front of you is a table with 100 coins. The coins have two sides (amazing, isn't it?) - one side is black, the other white. You know that 90 of the coins are with the black side up, 10 are with the white side up. All coins are arranged randomly on the table. All coins feel, smell and sound exactly the same on both sides (so don't try any tricks there).

Your job is to divide the coins on the table into two groups so that each group will have the same number of coins with the white side facing up.