Can not add column !!! (top_bottom_left_right.html)

dondo1020

Hi. I am trying to add some more columns to the sample code above and it break in this function, something with the column index. Do I have to set the total column count some where? Could someone give me some advise.
Thanks

function _fnSetCellData(oSettings, iRow, iCol, val) {

var oCol = oSettings.aoColumns[iCol];
var oData = oSettings.aoData[iRow]._aData;
oCol.fnSetData(oData, val);
}