Where to change the default Masthead image?

I want to change the default image in the Masthead for something more appropriate. Where would I do this?

Thanks,
Pat

It's defined by this css rule:

.t4-masthead .ja-masthead {
    background-image: url("../images/bg-masthead.jpg");
    background-position: center center;
}

You can override this rule or change the image: /templates/ja_resort/images/bg-masthead.jpg

Perfect! Thank you!!