Get linked image path

Hello!

I want to change a low res image to a hi res image, but I can't get the low res path.

for (var pageItemIdx = 0; pageItemIdx < myDocument.allPageItems.length; pageItemIdx++) {

  var pageItem = myDocument.allPageItems[pageItemIdx];

    if ( "geometricBounds" in pageItem && pageItem instanceof Rectangle ) {

      try  {

        app.consoleout( pageItem.allGraphics.itemLink.filePath );

      } catch (error) {

        app.consoleout( error.toString() );

      }

    }

}

pageItem.allGraphics.itemLink.filePath does not work....using applescript I was able to do it with

return file path of item liink of image....

But with javascript I can't

Anyone?