To validate text entries:
1. Select the range of cells.
2. From the Data menu, select Validation.
3. Select the Settings tab.
4. From the Allow dropdown list, select Custom.
5. In the Formula box, enter the following formula:
where A1 is the first cell in the range.
6. Click OK.
The applications/code on this site are distributed as is and without warranties or liability. In no event shall the owner of the copyrights, or the authors of the applications/code be liable for any loss of profit, any problems or any damage resulting from the use or evaluation of the applications/code.