* Process a particular cell-zkCell
*/
private WritableCell exportCell(Cell zkCell, int row, int col) {
WritableCell wCell = null;
try {
Formula formula = zkCell.getFormula();
if (formula != null) {
String f = formula.toString();
wCell = new jxl.write.Formula(col, row, f.substring(1,
f.length()));
} else {
Object result = zkCell.getResult();
WritableCellFormat wcf = exportCellFormat(result, zkCell.getFormat());