🚀 go-pugleaf

There are examples to be found in this forum (and its archive), but they might take some tracking down.

The first issue you'll face is determining which images you're talking about. Let's say you have a variable called myImages into which you've put a list of references to the images of interest:

tell application "InDesign 2.0.2"
 set minX to 100000 -- ridiculously large number
 set maxX to -100000 -- ridiculously negative number
 set itemCenters to {}
 repeat n from 1 to count of myImages
  set myBounds to visible bounds of item n of myImages
  if item 2 of myBounds < minX then set minX to item 2 of myBounds
  if item 4 of myBounds > maxX then set maxX to item 4 of myBounds
  copy ((item 4 of myBounds + item 2 of myBounds)/2) to end of itemCenters
 end repeat
set targCenter to (maxX + minX)/2
-- at this point each item center is in the itemCenters, so
repeat n from 1 to count of myImages
 set myMove to targCenter - (item n of itemCenters)
 move item n of myImages by {myMove,0}
end repeat
end tell

I just typed that off the top of my head, so there might be some errors, but I hope that gives you and idea of the process.

Dave