finding a message's thread level number

[paras dagli <paras_dagli@yahoo.com>]

is there any way to get a message's thread level
number.

for example:

message A
  message B
    message C
  message D
message E

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

thanks,

paras

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