Javascript works for text field, but not date ??

Question

Hi,
I'm trying to calculate work-day hours based on a start and end date range, as the dates are changed (using onChange event). I tend to do this kind of thing in chunks, so I started with a very basic script that should simply update 1 item with the value of another, when it is changed.
function change(){
html_GetElement('P51_UPDATE_TO').value = html_GetElement('P51_UPDATE_FROM').value;
As log as P51_UPDATE_FROM is a text field, P51_UPDATE_TO updates fine. If P51_UPDATE_FROM is a date field however (as it should be), P51_UPDATE_TO doesn't udpate at all. Any ideas why this might not work with a date field update?
Many thanks,
albertmi

Answer 1

After playing around a bit more, I notice that manually typing in a new date will trigger the onChange event, but I can't get it to work when using the date picker...is there a way around this?