Prove that $\displaystyle A_{n}$ contains a subgroup isomorphic to $\displaystyle S_{n-2}$ for all $\displaystyle n\geq 3$

$\displaystyle A_{n}$ being the alternating group of degree n and S the symmetric group.

I really have no idea how to approach this and it's had me stumped for quite a while. Any help would be much appreciated.