how to remove the limit from any code in the FOR loop..

hi,
i want help in the code below i have been using an alert based programming . in this i have used FOR loop and will check for rows 10000 only i want to make it free from any limit ..it can check endless rows ..please help.. as i have tried putting ten lakh in FOR loop it makes the running very slow or sometimes hangs.
the startting should be from row 3 but no limit of end row

i hope that u have understand the problem.

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Use a Do While/Do Until construct

i dont know how to takle this...
in this i m making the alert functionality that is in this the message box will appear telling u to pay the service tax,vat etc ..regarding my company and if write done in a column it will not give that particular message box..

in this it will show the message box for only 10000 rows but i want it for all the rows. i cant put all row number in for loop as it hangs. so please help.

thanks done.. used while loop..... :D