Inserting rawValue as subject in email

I have designed several forms in LiveCycle and would like an ID# to be included in the subject line when the user clicks a "Submit Email" button.

The ID# is entered into a field named "ID" in the form.

I created a button (mouse up) and entered the following JavaScript:

var myDoc = event.target;
var g = this.getField("ID");

myDoc.mailDoc({
bUI: true,
cTo: "A [at] a [dot] com",
cCC: "A [at] a [dot] com",
cSubject: g,
cBody: "Body1"
});

When I click the button nothing happens (in preview or in the actual form after it has been saved). Other JavaScript codes have worked fine for me in the past, so I think that I am correctly associating the button with the event, but I may be missing something really basic.

I have been working on this for hours with no luck; any help would be appreciated.

Thanks,

Rio