Element OnReset Event?

On my form, I turn the forecolor blue when an element's value changes by
comparing a custom "origVal" tag on each element. This works fine.

Then, when the user resets the form (double escape key), the onreset event
fires. I then loop through all the elements in the form and change the
forecolor back to black. This also works. However, it takes a long time to
loop through this because of the large number of elements on the page.

If possible, I want to process only the elements that have been reset, not
all of them. Is there some undocumented event or some method I can use to
revert the forecolor on only the changed items?

I already tried adding an "onreset" attribute to each element, but that
didn't fire. Also, the onchange event does not apply because it only fires
when a single element loses focus and has a changed value.