Scripting for different numbers of table rows in cs3

Question

As always thank you for the help.
My question: is there a simple newbie way to script for stroke placements when the numbers of rows in the category between the stroke will vary. I have not even attempted to script this style, as frankly I don't know where to start, but here is an explanation of what I need:
The table foodstuff contains:
animal, vegetable, fruit
Under animal there is:
beef, lamb, pork, poultry
Under vegetable there is:
potato, pepper, onion
Under fruit there is:
orange
If wanted a line under each category, ie after poultry, after onion, and after orange how would I go about it.
Thank you to all who have helped me so far, either by reading answers to other people's queries, or by responding directly to my own

Answer 1

Interesting ... I don't think there is a newbie-level answer to this challenge. It comes down to finding the first (left-to-right) cell that contains text, and adding a line on top of it all the way to the last cell in that row.
Here's a first attempt:
table = app.selection[0];
if (table.hasOwnProperty("baseline"))
table = table.parent;
if (table instanceof Cell)
table = table.parent;
if (table instanceof Column)
table = table.parent;
if (table instanceof Row)
table = table.parent;
if (table instanceof Table)
table.cells.everyItem().properties = {topEdgeStrokeWeight:0, bottomEdgeStrokeWeight:0, leftEdgeStrokeWeight:0, rightEdgeStrokeWeight:0};
table.rows.lastItem().bottomEdgeStrokeWeight = 1;
for (r=0; r<table.rows.length; r++)
  for (c=0; c<table.rows[r].cells.length; c++)
   if (table.rows[r].cells[c].contents)
    for (; c<table.rows[r].cells.length; c++)
     table.rows[r].cells[c].topEdgeStrokeWeight = 1;
    break;
} else
alert ("You were supposed to be somewhere inside a Table");