Asus a6000 keyboard

Keyboards are most generally held by screws in one of two places. 1- On the bottom, could be marked with a K, With bottom screws, the keyboard may have tabs on it holding it, you will need to pry the tabs gently out away from the plastics. 2- towards the top of the keyboard under the power button strip. Try this link, you may be able to find a breakdown diagram for your machine there.
http://repair4laptop.org/notebook.html

Don't be afraid to remove all the screws on the bottom of the machine if you're unsure as to which are for the keyboard, it won't hurt anything as long as you get them all back in. If they're marked with a B, it's a motherboard screw, and P is for plastic casing.