Javascript: inserting rows in a table on IE 5 for Macs

If I want to insert a row into a table in HTML, I can use this code on IE on a Windows computer

Code:

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        // Add a row below the current row
        objNewRow = objTable.insertRow(intIndex+1);       
       
        // set the class name to the same as the source row
        objNewRow.className = objRow.className;       
       
        // copy each cell form the source row to the new row
        for(var intCellCount = 0; intCellCount < intNumCells; intCellCount++)
        {
                objNewRow.insertCell();
                objNewRow.cells[intCellCount].innerHTML = objRow.cells[intCellCount].innerHTML;
        }

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However, insertRow does not work for IE on the Macintosh. How would I insert a row in a table on ie for Macs?

Thanks