Ajax Question - Update Panel - multiple textboxes in an html table

[Elmo Watson]

I've got quite a few textboxes on my page, along with labels, within a
table.

In these textboxes, I use the onTextChanged event (with autopostback=true)
to calculate some formulas, and put the finished numbers in labels - and
I'd like to use AJax to remove the screen flickering - - but for now, it's
not happening.

I've got a script manager on the screen with
EnablePartialRendering="true"

and an update panel, with the entire table (including the textboxes and
labels)

But it's still flickering - - first off - can this be done with AJax
(stopping the flickering)? If so - what am I missing?