>In an existing application which I am modifying an auditlog which records values before and after the changes to the fields.Currently audit log is done by calling a generic function, i.e.
>
> x = auditlog('table','key','keyvalue')
>
>For a few fields in one table a comment also has to entered if the field changes. I do not want to rewrite the function since I do not know how many comments I will have and I do not want to break existing code. What is best way of doing this. Some possiblities I condidered,
>1. add some form properties to hold the comments but can I use them in the function with out explicitly passing then to the function, if so how?
>2. create public variables that get released as soon as I return form function, do not care for this one if I can avoid it.
>3. other ideas?

You can use form properties and you do not need to pass them to function. Instead you may pass form object itself:
x=auditlog(....,thisform)
and use it within your function:
function x
lparameter ....,oForm
=messagebox(oForm.mycomment)