Its quite easy, but I don't know how to draw here...umm Ill try to do it in words.
You need 2xSPDT switches, ie, 3 terminals without center stop.
Lets give the wires colors.
From the
battery, for example, red + and black -
Take the black to one of the terminals of the light.
Take the red to center of the "outside" switch
Take another red to from top terminal of outside switch to top terminal of inside switch.
Take another red to from the bottom terminal of the outside switch to the bottom of the inside switch.
Take another red from the center of the inside switch to the other terminal of the light.
Pos-----s============s-------L
Neg---------------------------------------L
No worries mate...
There ya go.