Changing table direction - script

Hello all,

I have a series of large Arabic documents where I need to flip the table direction to RTL. I've cobbled together the following:

var a = app.activeDocument.textFrames.everyItem().tables.everyItem().getElements();

for (var i=a.length-1; i > 0; i--){

a[i].tableDirection = TableDirectionOptions.RIGHT_TO_LEFT_DIRECTION;

}

It seems to work but doesn't catch every table - what have I left out?