Jeepman, this is how I play it, but I doubt it's really right. It works for me, but you'll probably want to solicit more authoritative help! I don't know how to do line breaks etc. so my system is as follows: I'll put the chord in parentheses just before the word where the chord changes.

(G)What'll I do when (Cm7)you are (G)far a- (Am7)way, and (G)I (Cm)am (Am)blue, (D)what'll I (G)do. (Second verse, same as the first). Bridge: What'll I (C)do with just a (Cm7)photograph to (G)tell (Cm7)my (E)troubles (A)to? (Third verse, same as the first).

Hope you can make sense of this! Margaret