Find character of table in indesign using applescript

Hi ,

I have one story and it contains 5 tables.

I need index of character  for table 4 in story 1. Please help me.

my code is shown in below. this is right or not please check .

tell application "Adobe InDesign CS6"

    tell active document

        set indx to index of character 1 of table 4 of story 1

    end tell

end tell

if any wrong in my coding please tell me.