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[[Image:7805_schematic.png | 350px ]]
Notice the regulator has three legs. Each of these legs has to be connected to the right thing. From page 2 of the [http://www.fairchildsemi.com/ds/LM/LM7805.pdf datasheet], under "Pin Assignment" we see what each of the legs are. Looking at the front, they are numbered 1, 2, and 3, from left to right, and are labeled "Input", "GND" , and "Output":
[[Image:7805_pinout.png | 200px]]