Using a FUNCTION

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I have two functions that I've used in web pages that I'd like to use here.
In particular, one function returns the IP address of the connected remote machine. I'd like to assign that to a record column BEFORE the record is presented for editing or adding and of course before it is added to a table.
The next one returns the PROPER case of text that is entered. I'd like to be able to use this when a user EXITS a field in a form and is entering another field.
For example: User enters first name, then goes to last name. I'd like to use this function after the first name is entered (or alternatively BEFORE the last name is entered). I suppose this is the same thing (Before or After) except I suspect this would be some kind of event.
How can I do this? Do I add my function asp code to a directory (if so how does ASPrunner know about my stuff), or do I do this programatically?
I'm not sure if this would be a Global Event or Table event. I suspect a Table event. But which one and to what field to I assign the result to?
I want do to this Subscription Page.
Hopefully this is clear. If more info is required I can certainly provide it.
Thanks and cheers.