Finding a message's thread level number

[paras dagli <paras_dagli@yahoo.com>]

is there anyway for finding a message's thread level
number.

for example:

message A
  message B
    message C
  message D
message E

so,
message A thread level is 0
message B thread level is 1
message C thread level is 2
message D thread level is 1
message E thread level is 0

paras

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