Pause the execution of a function

Dear all,

I am trying to write a script to pause the execution of a function and
provide some additional commands to the function and then continue execution
of the function. For example, when my function detects a wrong number in a
dataset, the function pauses automatically and returns information on the
screen:

?There is a wrong number in the dataset. Would you like to correct it? ?

If I input ?yes? from the keyboard and hit the enter key, the function asks
again:

?What is the correct number??

After inputting a correct number from the keyboard and hitting the enter
key, the function continues to execute.

Can anybody please help how to get this done? Thanks a lot in advance

Lisa


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