Table styles to all of document?

Question

I have a script (kindly taken from this forum, see below) that applies table/cell styles to a tables you have selected, is there a way to apply this to all tables in the document in one go?
its a basic style, just a header row body content and footer row.
Many thanks.
// using your version; I'd prefer to return 0 if table not found
function findTable(obj) {
         while (obj.constructor.name != "Table") {
        obj = obj.parent;
        if (obj.constructor.name == "Application") {
            throw "Can't find table"
    return obj
var myTable = 0;
if (app.documents.length > 0 && app.selection.length > 0)
    myTable = findTable(app.selection[0]);
// check for at least enough rows for 1 top row, 1 body row, 1 bottom row
if (myTable != 0 && myTable.rows.length >= 3) {
    // delete all rules; set insets to 0
    myTable.cells.everyItem().appliedCellStyle = "[None]";
    // format bottom row
    // (remember rows uses 0-based count)
    a = myTable.rows.length - 1;
    myTable.rows[a].cells.everyItem().appliedCellStyle = "4.cell_body_last";
    // format middle rows
    first = 1;
     last = myTable.rows.length - 2;
    for (a = first; a <= last; ++a)
        myTable.rows[a].cells.everyItem().appliedCellStyle = "3.cell_body";
    // format top row
    a = 0;
    myTable.rows[a].cells.everyItem().appliedCellStyle = "2.cell_header";

Answer 1

(Stepping in for Ram)
It's a bit easier than you think. Ram's code physically selects each table, and that's not even necessary. I'd change his
var myTab = MyDoc.textFrames[i].tables[j];
                myTab.select();
                YourFunction(); // Call your function here
(which works on a selection) to
myTab = MyDoc.textFrames[i].tables[j];
ProcessOneTable (myTab);
(still using a variable, although that's not really necessary). Then change your code into a function, like this. Remove the lines
var myTable = 0;
if (app.documents.length > 0 && app.selection.length > 0)
    myTable = findTable(app.selection[0]);
and replace with
function ProcessOneTable(myTable)
-- and add a closing brace after the very last line. As you can see, the function gets called with a variable "myTable" set to each one of the tables in your current document. The rest should stay unchanged.