Can setting a value through javascript invoke an HTML event

[Stephen Rufle]

I have a field on my page that uses a pop-up window to allow input. When 
you click the link in the pop-up. I use javascript to set the vale on 
the parent page. Is there a way to invoke some HTML event that I could 
then handle. I had thought the onChange or onBlur events would fire, but 
neither do.