Javascript & Iframe, auto fill-out user name and password

Hi All
Aside from compliance considerations, is there any way to auto-populate the username and password fields when embedding Teradata Views via the Javascript API.
I can easily get the API to work, but usually I would use javascript to change the <iframe> form values, but somehow I cannot access the input fields.
 
Anybody with some advice, on how to access the input fields "name" and "pw", so one can change their values, using javascript or JQuery?
 
Best regards
Chris