a little help please-voltage regulator

how to actually determine which is input/output/base for voltage regulator(78L05)

if we see from the 3pins, the flat spot is facing up(sky) and the rounded on facing down(ground) , what is pin most left?middle?and most right?
or is there any other way to determine all those pins?

thanks guys..

Try using Google.

JimB

This is copied from National's 78L05 data sheet.

thanks a lot...