How can I load text into Midtier text fields?

I have a javascript which reads a cookie value and posts it into a text field. Problem is that Remedy only recon. the data if I enter the field manually - don't need to write anything. Otherwise MidTier does not fetch te data.

How can I make MidTier see this data without entering the field (SET fields, Change Field doesn't help)

SENSIE/23

Found the solution ... window.theForm.setFieldValue(,) does the trick.

SENSEI/323