In Minecraft how is an enchantment table built?

http://minecraft.gamepedia.com/...ment_Table

It's fairly easy to build, you will need the following however:
5 Diamonds (2 for the table itself, 3 for a diamond pick)
2 Sticks (for a diamond pick)
4 Obsidian (which is what you need the diamond pick to harvest)
1 piece of leather (for the book needed)
3 sugarcane (for the paper which the book needs)

To "Improve" the table however, it needs to be put near bookcases. See the link below for more details. http://minecraft.gamepedia.com/..._mechanics