Spawning autoupdate from a non-user event

[Rap]

I'm writing pages that pull in Excel data into text boxes
on the client side, and if certain key fields are present,
I want to pull additional data out of a database and
display that as well. I'd like it to work automagically
on textChange but the insertion itself in client VB script
doesn't do the trick and spawn the actual autoupdate
event. Neither does programmatically creating focus and
blur or click events. I'd like the fields to be read-
only. At the moment, I make users hit an extra button.
Any other ideas?

Thanks!