Black and white with a POP of colour

I had a friend ask how I achieved this photo shop technique, so thought Id share it with all of you.

Here is my black and white photo with its pop of colour...

this is the original photo I have used for my example.

I'm using photo shop cs2 and this is what I do...
Open up Windows by clicking on the word windows near the top of your screen.
Press on the word Layers, so the pop up box appears.
Click on the word Layer, near the top of your screen again.
Click on duplicate layer...click OK
Ensure you have your background copy layer selected in the layers palette.
Click on image, again this can be found near the top of your computer screen.
Click on adjustments.
Click on desaturate.
Select the eraser tool from the tools palette (right hand side of your screen)
Now all you need to do is to rub out the areas you wish to have coloured by holding down the left hand mouse button and moving your curser over the area that is to be erased....
You may need to alter your brush size and zoom in on your image to make this process easier for your self.

Give it a go, its very simple and can look super effective