Mareena,
Welcome to the JavaRanch! We don't have many rules around the 'Ranch, but we do require your display name to follow the
JavaRanch Naming Policy.
You can change it
here.
You can open a window with the window.open() method;
from the child window, you can talk to the parent
window.opener.document.FormName.ElementName.value = "blah";
That is the basic idea....
Eric