saving vanity mirror

Home Gurus,

The mirror in the master bathroom is

forming ragged edge at bottom-right

hand corner. Small chunks of mirror

are coming out (so far the peel-out

of glass < 1/2inch from the original

line.

My Qs

a) What can I do to stop chipping away of the mirror at the edge?

b) How much does it cost to have

a simple frame around 2.5ft X 4ft

mirror by a professional (not a

fancy one, though); approx would

do

Thanks